FILE - In this Nov. 27, 2007, file photo, IBF featherweight boxing champion Robert Guerrero works out in Gilroy, Calif. Guerrero withdrew from his scheduled fight against interim titleholder Michael Katsidis this week to spend more time with his wife, who has been battling cancer. Guerrero was scheduled to fight Katsidis on March 27 in what would have been a major break in his young career. The fight was to have been televised by HBO.

Boxer Bernard Hopkins, top center, is surrounded by reporters after a news conference on Tuesday, Feb. 9, 2010, in New York, to announce a rematch against Roy Jones Jr., to be held April 3 in Las Vegas.

Boxer Roy Jones Jr., center, is surrounded by reporters after a news conference on Tuesday, Feb. 9, 2010, in New York, to announce a rematch against Bernard Hopkins, to be held April 3 in Las Vegas.

Boxers Bernard Hopkins, third from left, and Roy Jones Jr., third from right, are seperated by fight promoters while posing for photographers during a news conference, Tuesday, Feb. 9, 2010, in New York, to announce a rematch, to be held April 3 in Las Vegas.

Boxer Roy Jones Jr. speaks to reporters during a news conference, Tuesday, Feb. 9, 2010, in New York, to announce a rematch against Bernard Hopkins, to be held April 3 in Las Vegas.

Boxer Bernard Hopkins speaks to reporters during a news conference Tuesday, Feb. 9, 2010 in New York, to announce a rematch against Roy Jones Jr., to be held April 3 in Las Vegas.

Boxer Bernard Hopkins (L) speaks as Roy Jones Jr. listens during the news conference announcing their rematch bout in New York February 9, 2010. The bout will be a rematch for the two fighters who faced each other 17 years ago and is set for April 3 at the Mandalay Bay Events Center in Las Vegas. REUTERS/Shannon Stapleton (UNITED STATES - Tags: SPORT BOXING)

Boxer Roy Jones Jr. (R) speaks as Bernard Hopkins listens during the news conference announcing their rematch bout in New York February 9, 2010. The bout will be a rematch for the two fighters who faced each other 17 years ago and is set for April 3 at the Mandalay Bay Events Center in Las Vegas. REUTERS/Shannon Stapleton (UNITED STATES)

Boxer Roy Jones Jr. (R) speaks as Bernard Hopkins listens during the news conference announcing their rematch bout in New York February 9, 2010. The bout will be a rematch for the two fighters who faced each other 17 years ago and is set for April 3 at the Mandalay Bay Events Center in Las Vegas. REUTERS/Shannon Stapleton (UNITED STATES - Tags: SPORT BOXING)

Danish super-middleweight boxer Mikkel Kessler (L) boxes during a press training in Berlin on February 9, 2010. Kessler lost his WBA super middleweight title against US boxer Andre Ward in November 2009. AFP PHOTO DDP/ SIMON KLINGERT GERMANY OUT (Photo credit should read Simon Klingert/AFP/Getty Images)

Danish super-middleweight boxer Mikkel Kessler (L) poses during a press training in BErlin on February 9, 2010. Kessler lost his WBA super middleweight title against US boxer Andre Ward in November 2009. AFP PHOTO DDP/ SIMON KLINGERT GERMANY OUT (Photo credit should read Simon Klingert/AFP/Getty Images)

Danish super-middleweight boxer Mikkel Kessler (L) gets ready for a press training in BErlin on February 9, 2010. Kessler lost his WBA super middleweight title against US boxer Andre Ward in November 2009. AFP PHOTO DDP/ SIMON KLINGERT GERMANY OUT (Photo credit should read SIMON KLINGERT/AFP/Getty Images)

Danish super-middleweight boxer Mikkel Kessler (R) gets ready for a press training in BErlin on February 9, 2010. Kessler lost his WBA super middleweight title against US boxer Andre Ward in November 2009. AFP PHOTO DDP/ SIMON KLINGERT GERMANY OUT (Photo credit should read SIMON KLINGERT/AFP/Getty Images)

Thailand's Denkaosen Kaowichit, left, reacts after taking a right hook from Japan's Daiki Kameda during eighth round action in their WBA flyweight title match at Kobe World Memorial Hall in Kobe, western Japan, on Sunday Feb. 7, 2010.

Japanese challenger Daiki Kameda (L) fights against the champion Denkaosan Kaovichit of Thailand during their WBA flyweight title match in Kobe, Hyogo prefecture, western Japan on February 7, 2010. Kameda defeated Denkaosan by unanimous decision. AFP PHOTO / JIJI PRESS (Photo credit should read JIJI PRESS/AFP/Getty Images)

Japanese challenger Daiki Kameda (L) lands a left straight onto the champion Denkaosan Kaovichit of Thailand during their WBA flyweight title match in Kobe, Hyogo prefecture, western Japan on February 7, 2010. Kameda defeated Denkaosan by unanimous decision. AFP PHOTO / JIJI PRESS (Photo credit should read JIJI PRESS/AFP/Getty Images)

Japanese Daiki Kameda, left, and Denkaosen Kaowichit from Thailand battle it out during third round action in their WBA flyweight title match at Kobe World Memorial Hall in Kobe, western Japan, on Sunday Feb. 7, 2010.

Japanese Tsunami Tenkai, right, clobbers Shanee Martin from Britain during ninth round action in the Women's WBA super flyweight title bout at Kobe World Memorial Hall in Kobe, western Japan, on Sunday Feb. 7, 2010.

Japanese Tsunami Tenkai, left, clobbers Shanee Martin from Britain during fourth round action in the Women's WBA super flyweight title bout at Kobe World Memorial Hall in Kobe, western Japan, on Sunday Feb. 7, 2010.

Venezuela's Edwin Valero, right, exchanges punches with Mexico's Antonio DeMarco at a WBC lightweight title fight in Monterrey, Mexico, Saturday, Feb. 6, 2010. Valero won on a TKO after DeMarco sat in his corner and declined to come out for the 10th round. On Valero's chest is a tattoo of Venezuela's President Hugo Chavez and his nation's flag.

Venezuela's Edwin Valero is seen during a WBC lightweight title fight with Mexico's Antonio DeMarco in Monterrey, Mexico, Saturday, Feb. 6, 2010. Valero won on a TKO after DeMarco sat in his corner and declined to come out for the 10th round. On Valero's chest is a tattoo of Venezuela's President Hugo Chavez and his nation's flag.

Interim WBC lightweight champion Mexican Antonio DeMarco is comforted by his seconds after losing against WBC World Champion of the lightweight division Edwin Valero of Venezuela after their fight to determine the absolute world championship title in the Arena Monterrey stadium in Monterrey on February 6, 2010. Valero won by technical knockout in the ninth round. AFP PHOTO/Omar TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

World Boxing Council (WBC) World Champion of the lightweight division Edwin Valero (R) from Venezuela battles with interim champion Mexican Antonio DeMarco during their fight to determine the absolute world championship title in the Arena Monterrey stadium in Monterrey on February 6, 2010. Valero won by technical knockout in the ninth round. AFP PHOTO/Omar TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

blood leaks from a gash on the forhead of World Boxing Council (WBC) World Champion of the Lightweight division Edwin Valero of Venezuela during his fight against interim champion Mexican Antonio DeMarco to determine the absolute world championship title in the Arena Monterrey stadium in Monterrey on February 6, 2010. Valero won by technical knockout in the ninth round. AFP PHOTO/Omar TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

World Boxing Council (WBC) World Champion of the lightweight division Edwin Valero (L) from Venezuela lands a punch on interim champion Mexican Antonio DeMarco during their fight to determine the absolute world championship title in the Arena Monterrey stadium in Monterrey on February 6, 2010. Valero won by technical knockout in the ninth round. AFP PHOTO/Omar TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

World Boxing Council (WBC) World Champion of the lightweight division Edwin Valero of Venezuela celebrates his victory over interim champion Mexican Antonio DeMarco during their fight to determine the absolute world championship title in the Arena Monterrey stadium in Monterrey on February 6, 2010. Valero won by technical knockout in the ninth round. AFP PHOTO/Omar TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

World Boxing Council (WBC) World Champion of the lightweight division Edwin Valero (L) from Venezuela battles with interim champion Mexican Antonio DeMarco during their fight to determine the absolute world championship title in the Arena Monterrey stadium in Monterrey on February 6, 2010. Valero won by technical knockout in the ninth round. AFP PHOTO/Omar TORRES (Photo credit should read OMAR TORRES/AFP/Getty Images)

Edwin Valero, of Venezuela, celebrates his victory over Mexico's Antonio DeMarco at a WBC lightweight title fight in Monterrey, Mexico, Saturday, Feb. 6, 2010. Valero won on a TKO after DeMarco sat in his corner and declined to come out for the 10th round. On Valero's chest is a tattoo of Venezuela's President Hugo Chavez and his nation's flag.

Venezuela's Edwin Valero, left, exchanges punches with Mexico's Antonio DeMarco at a WBC lightweight title fight in Monterrey, Mexico, Saturday, Feb. 6, 2010. On Valero's chest is a tattoo of Venezuela's President Hugo Chavez and his nation's flag.

A tattoo of Venezuela's flag and President Hugo Chavez are seen on the chest of Venezuela's boxer Edwin Valero during his WBC lightweight title fight with Mexico's Antonio DeMarco in Monterrey, Mexico, Saturday, Feb. 6, 2010. Valero won on a TKO after DeMarco sat in his corner and declined to come out for the 10th round.

Venezuela's Edwin Valero, left, exchanges punches with Mexico's Antonio DeMarco at a WBC lightweight title fight in Monterrey, Mexico, Saturday, Feb. 6, 2010. Valero won on a TKO after DeMarco sat in his corner and declined to come out for the 10th round.

Edwin Valero, of Venezuela, celebrates his victory over Mexico's Antonio DeMarco at a WBC lightweight title fight in Monterrey, Mexico, Saturday, Feb. 6, 2010. On Valero's chest is a tattoo of Venezuela's President Hugo Chavez and his nation's flag.

Louisville native Muhammad Ali leaves the Freedom Hall court after an introduction during a timeout in the Rutgers-Louisville NCAA college basketball game in Louisville, Ky., Saturday, Feb. 6, 2010.

Suszannah Warner of the U.S. (L) reacts after she was defeated by South Korea's Park Ji-hyun by a decision at the straw-weight world title match of International Female Boxers Association (IFBA) in Mungyeong, southeast of Seoul February 6, 2010. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING)

Suszannah Warner of the U.S. (L) fights against Park Ji-hyun of South Korea during the straw-weight world title match of International Female Boxers Association (IFBA ) in Mungyeong, southeast of Seoul February 6, 2010. Park defended the title. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING IMAGES OF THE DAY)

Suszannah Warner of the U.S. (R) fights against Park Ji-hyun of South Korea during the straw-weight world title match of International Female Boxers Association (IFBA ) in Mungyeong, southeast of Seoul February 6, 2010. Park defended the title. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING)

Suszannah Warner of the U.S. (L) fights against Park Ji-hyun of South Korea during the straw-weight world title match of International Female Boxers Association (IFBA ) in Mungyeong, southeast of Seoul February 6, 2010. Park defended the title. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING)

Malcolm Tunacao of the Philippines (C) celebrates after he won the vacant bantamweight title of Oriental and Pacific Boxing Federation (OPBF) against Chae Seung-suk of South Korea in Mungyeong, southeast of Seoul February 6, 2010. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING)

Malcolm Tunacao of the Philippines celebrates after he won the vacant bantamweight title of Oriental and Pacific Boxing Federation (OPBF) against Chae Seung-suk of South Korea in Mungyeong, southeast of Seoul February 6, 2010. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING)

Malcolm Tunacao of the Philippines (L) celebrates with his coach after he won the vacant bantamweight title of Oriental and Pacific Boxing Federation (OPBF) against Chae Seung-suk of South Korea in Mungyeong, southeast of Seoul February 6, 2010. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING)

Malcolm Tunacao of the Philippines (R) fights against Chae Seung-suk of South Korea during a match for the vacant bantamweight title of Oriental and Pacific Boxing Federation (OPBF) in Mungyeong, southeast of Seoul February 6, 2010. Tunacao won the title. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING)

Malcolm Tunacao of the Philippines (L) fights against Chae Seung-suk of South Korea during a match for the vacant bantamweight title of Oriental and Pacific Boxing Federation (OPBF) in Mungyeong, southeast of Seoul February 6, 2010. Tunacao won the title. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT BOXING)

In this image released by Showtime, boxer Edwin Valero, of Venezuela, works out at Thai Champ Ringside Gym on Wednesday, Feb. 3, 2010, in Monterrey, Mexico. Valero will defend his WBC lightweight title on Saturday in Monterrey against Antonio DeMarco,of Mexico (THE ASSOCIATED PRESS/Showtime, Tom Casino)

In this image released by Showtime, boxer Edwin Valero, of Venezuela, wraps his hand before a work out at Thai Champ Ringside Gym on Wednesday, Feb. 3, 2010, in Monterrey, Mexico. Valero will defend his WBC lightweight title on Saturday in Monterrey against Antonio DeMarco,of Mexico

In this image released by Showtime, boxer Antonio DeMarco,of Mexico, works out at Thai Champ Ringside Gym on Wednesday, Feb. 3, 2010, in Monterrey, Mexico. DeMarco will fight Edwin Valero, of Venezuela, on Saturday night in Monterrey, for Valero's WBC for lightweight title.

In this image released by Showtime, boxer Antonio DeMarco, of Mexico, is shown at Thai Champ Ringside Gym on Wednesday, Feb. 3, 2010, in Monterrey, Mexico. DeMarco will fight Edwin Valero, of Venezuela, on Saturday night in Monterrey, for Valero's WBC for lightweight title.

In this image released by Showtime, boxer Edwin Valero, of Venezuela, works out at Thai Champ Ringside Gym on Wednesday, Feb. 3, 2010, in Monterrey, Mexico. Valero will defend his WBC lightweight title on Saturday in Monterrey against Antonio DeMarco,of Mexico

TO GO WITH AFP STORY BY MARTIN PARRY (FILES) A file photo taken on February 20, 2002 shows then-former US figure skater turned boxer Tonya Harding smiling as she is introduced during a pre-fight news conference in Tunica, Mississippi. A month before the Lillehammer winter Olympic games in 1994, the ex-husband of Harding arranged for an attack on her closest rival, Nancy Kerrigan, which forced her out of the US Figure Skating Championships. The Winter Olympics is no stranger to controversy and organizers of the February 12 to 28, 2010 games in Vancouver will be hoping there is no cheating, doping or any other dirty tricks to tarnish its reputation. AFP PHOTO/Tannen MAURY (Photo credit should read TANNEN MAURY/AFP/Getty Images)

Danish boxer Mads Larsen (l) fights for the vacant super middleweight European championship title against Brian Magee from Northern Ireland on January 30, 2010 in Aarhus. Brian Magee won the match in the 7th round. AFP PHOTO / Henning Bagger/Scanpix (Photo credit should read HENNING BAGGER/AFP/Getty Images)

Danish boxer Mads Larsen (R) fights for the vacant super middleweight European championship title against Brian Magee from Northern Ireland on January 30, 2010 in Aarhus. Brian Magee won the match in the 7th round. AFP PHOTO / Henning Bagger/Scanpix (Photo credit should read HENNING BAGGER/AFP/Getty Images)

WBA world boxing champion Sebastian Sylvester from Germany, right, and his contender the American Billy Lyell, left, are seen during the official Weigh-In in Neubrandenburg, northern Germany, Friday, Jan. 29, 2010. Sylvester and Lyell will have a WBA world boxing championship middleweight title fight in Neubrandenburg at Saturday, Jan. 30, 2010.

U.S. boxer Billy Lyell is seen during the official Weigh-In in Neubrandenburg, northern Germany, Friday, Jan. 29, 2010. Billy Lyell and acting champion Sebastian Sylvester from Germany will have a WBA world boxing championship middleweight title fight in Neubrandenburg at Saturday, Jan. 30, 2010. (apn Photo/Frank Hormann)

WBA world boxing champion Sebastian Sylvester from Germany is seen during the official Weigh-In in Neubrandenburg, northern Germany, Friday, Jan. 29, 2010. Sylvester and his American contender Billy Lyell will have a WBA world boxing championship middleweight title fight in Neubrandenburg at Saturday, Jan. 30, 2010.

Belgian boxer Sugar Jackson attends a hearing session a Flemish tribunal on January 28, 2010, in Gent. Sugar Jackson was handed a one-year ban on on November 6, 2009 for failing to comply with doping regulations. AFP PHOTO BELGA PHOTO KURT DESPLENTER (Photo credit should read KURT DESPLENTER/AFP/Getty Images)

IBF, WBO and IBO heavy weight champion Wladimir Klitschko carries his belts during a news conference with his opponent US boxer Eddie Chambers from Philadelphia, Pennsylvania, in preparation for their boxing fight in Duesseldorf, western Germany, on Thursday Jan. 28, 2010. The fight will take place on March 20, 2010 at the Esprit Arena in Duesseldorf. (THE ASSOCIATED PRESS/Frank Augstein)

World heavyweight champion Ukrainian Vladimir Klitschko (L) and his challenger Eddie Chambers (R) of the US shake hands under the eyes of Chambers' promotor Dan Goosen during a press conference on January 28, 2010 in Duesseldorf, ahead of their IBF, WBO and IBO heavyweight boxing title fight scheduled on March 20, 2010 in Duesseldorf's football stadium, western Germany. AFP PHOTO DDP / CLEMENS BILAN GERMANY OUT (Photo credit should read CLEMENS BILAN/AFP/Getty Images)

World heavyweight champion Ukrainian Vladimir Klitschko (R) and his challenger Eddie Chambers of the US pose in the goal on the pitch during a press conference on January 28, 2010 in Duesseldorf, ahead of their IBF, WBO and IBO heavyweight boxing title fight scheduled on March 20, 2010 in Duesseldorf's football stadium, western Germany. AFP PHOTO DDP / CLEMENS BILAN GERMANY OUT (Photo credit should read CLEMENS BILAN/AFP/Getty Images)

World heavyweight champion Ukrainian Vladimir Klitschko (L) and his challenger Eddie Chambers of the US play football during a press conference on January 28, 2010 in Duesseldorf, ahead of their IBF, WBO and IBO heavyweight boxing title fight scheduled on March 20, 2010 in Duesseldorf's football stadium, western Germany. AFP PHOTO DDP / CLEMENS BILAN GERMANY OUT (Photo credit should read CLEMENS BILAN/AFP/Getty Images)

World heavyweight champion Ukrainian Vladimir Klitschko (L) and his challenger Eddie Chambers of the US pose during a press conference on January 28, 2010 in Duesseldorf, ahead of their IBF, WBO and IBO heavyweight boxing title fight scheduled on March 20, 2010 in Duesseldorf's football stadium, western Germany. AFP PHOTO DDP / CLEMENS BILAN GERMANY OUT (Photo credit should read CLEMENS BILAN/AFP/Getty Images)

World heavyweight champion Ukrainian Vladimir Klitschko (L) and his challenger Eddie Chambers of the US pose during a press conference on January 28, 2010 in Duesseldorf, ahead of their IBF, WBO and IBO heavyweight boxing title fight scheduled on March 20, 2010 in Leverkusen, western Germany. AFP PHOTO DDP / CLEMENS BILAN GERMANY OUT (Photo credit should read CLEMENS BILAN/AFP/Getty Images)

World heavyweight champion Vladimir Klitschko (L) and his challenger Eddie Chambers of the US pose during a press conference on January 28, 2010 in Duesseldorf, ahead of their IBF, WBO and IBO heavyweight boxing title fight scheduled on March 20, 2010 in Leverkusen, western Germany. AFP PHOTO DDP / CLEMENS BILAN GERMANY OUT (Photo credit should read CLEMENS BILAN/AFP/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine kicks a ball next to Eddie Chambers of USA during a press conference for their WBO Heavyweight Championship fight at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

IBF, WBO and IBO heavy weight champion Wladimir Klitschko, left, and his opponent US boxer Eddie Chambers from Philadelphia, Pennsylvania, pose during a news conference on a soccer pitch in preparation for their boxing fight in Duesseldorf, western Germany, on Thursday Jan. 28, 2010. The fight will take place on March 20, 2010 at the Esprit Arena in Duesseldorf.

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine shakes hands with Eddie Chambers of USA during a press conference for their WBO Heavyweight Championship fight at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Eddie Chambers of USA speaks during a press conference for his WBO Heavyweight Championship fight against Wladimir Klitschko of Ukraine at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Eddie Chambers of USA looks on next to his promoter Dan Goossen during a press conference for his WBO Heavyweight Championship fight against Wladimir Klitschko of Ukraine at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Promoter Dan Goossen speaks during a press conference for the WBO Heavyweight Championship fight between Wladimir Klitschko of Ukraine and Eddie Chambers of USA at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Rob Murray, head coach of Eddie Chambers, looks on during a press conference for the WBO Heavyweight Championship fight between Wladimir Klitschko of Ukraine and Eddie Chambers of USA at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine smiles with Eddie Chambers of USA during a press conference for their WBO Heavyweight Championship fight at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

Heavyweight title holder boxer Vladimir Klitschko of Ukraine poses with his title belts during a news conference in Duesseldorf January 28, 2010. Klitschko will fight Eddy Chambers of the U.S. for the WBO world heavyweight championship title on March 20, in Duesseldorf. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT BOXING)

Heavyweight title holder boxer Vladimir Klitschko of Ukraine (L) and Eddy Chambers of the U.S. pose during a news conference in Duesseldorf January 28, 2010. The boxers will fight for the WBO world heavyweight championship title on March, 20 in Duesseldorf. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT BOXING)

Heavyweight title holder boxer Vladimir Klitschko of Ukraine (L) and Eddy Chambers of the U.S. pose during a news conference in Duesseldorf January 28, 2010. The boxers will fight for the WBO world heavyweight championship title on March 20, in Duesseldorf. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT BOXING IMAGES OF THE DAY)

IBF, WBO and IBO heavy weight champion Wladimir Klitschko sits behind his belts during a news conference with his opponent US boxer Eddie Chambers from Philadelphia, Pennsylvania, in preparation for their boxing fight in Duesseldorf, western Germany, on Thursday Jan. 28, 2010. The fight will take place on March 20, 2010 at the Esprit Arena in Duesseldorf.

Heavyweight title holder boxer Vladimir Klitschko of Ukraine addresses a news conference in Duesseldorf January 28, 2010. Klitschko will fight Eddy Chambers of the U.S. for the WBO world heavyweight championship title on March 20, in Duesseldorf. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT BOXING)

Heavyweight title holder boxer Vladimir Klitschko of Ukraine (L) faces Eddy Chambers of the U.S. during a news conference in Duesseldorf January 28, 2010. The boxers will fight for the WBO world heavyweight championship title on March, 20 in Duesseldorf. REUTERS/Ina Fassbender (GERMANY SPORT BOXING)

IBF, WBO and IBO heavy weight champion Wladimir Klitschko carries his belts during a news conference with his opponent US boxer Eddie Chambers from Philadelphia, Pennsylvania, in preparation for their boxing fight in Duesseldorf, western Germany, on Thursday Jan. 28, 2010. The fight will take place on March 20, 2010 at the Esprit Arena in Duesseldorf.

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine smiles during a press conference for his WBO Heavyweight Championship fight against Eddie Chambers of USA at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine speaks during a press conference for his WBO Heavyweight Championship fight against Eddie Chambers of USA at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine looks on during a press conference for his WBO Heavyweight Championship fight against Eddie Chambers of USA at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

Heavyweight title holder boxer Vladimir Klitschko of Ukraine plays a ball after a news conference in Duesseldorf January 28, 2010. Klitschko and Eddy Chambers of the U.S. will fight for the WBO world heavyweight championship title on March 20 in Duesseldorf. REUTERS/Ina Fassbender (GERMANY SPORT BOXING)

Heavyweight title holder boxer Vladimir Klitschko of Ukraine (L) plays a ball, while Eddy Chambers of the U.S. looks on after a news conference in Duesseldorf January 28, 2010. The boxers will fight for the WBO world heavyweight championship title on March, 20 in Duesseldorf. REUTERS/Ina Fassbender (GERMANY SPORT BOXING)

Heavyweight title holder boxer Vladimir Klitschko of Ukraine (L) and Eddy Chambers of the U.S. (R) pose during a news conference in Duesseldorf January 28, 2010. The boxers will fight for the WBO world heavyweight championship title on March, 20 in Duesseldorf. REUTERS/Ina Fassbender (GERMANY SPORT BOXING)

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine pose with Eddie Chambers of USA during a press conference for their WBO Heavyweight Championship fight at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Eddie Chambers of USA poses during a press conference for his WBO Heavyweight Championship fight against Wladimir Klitschko of Ukraine at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine faces Eddie Chambers of USA during a press conference for their WBO Heavyweight Championship fight at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

Heavyweight title holder boxer Vladimir Klitschko of Ukraine (L) and Eddy Chambers of the U.S. (R) pose during a news conference in Duesseldorf January 28, 2010. The boxers will fight for the WBO world heavyweight championship title on March, 20 in Duesseldorf. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT BOXING)

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine poses during a press conference for his WBO Heavyweight Championship fight against Eddie Chambers of USA at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

DUESSELDORF, GERMANY - JANUARY 28: Wladimir Klitschko of Ukraine pose with Eddie Chambers of USA during a press conference for their WBO Heavyweight Championship fight at the Esprit Arena on January 28, 2010 in Duesseldorf, Germany. The Championship fight will take place at the Esprit Arena on March 20, 2010 in Duesseldorf. (Photo by Lars Baron/Bongarts/Getty Images)

IBF, WBO and IBO heavy weight champion Wladimir Klitschko, left, and his opponent US boxer Eddie Chambers from Philadelphia, Pennsylvania, pose for photographers during a news conference in preparation for their boxing fight in Duesseldorf, western Germany, on Thursday Jan. 28, 2010. The fight will take place on March 20, 2010 at the Esprit Arena in Duesseldorf.

IBF, WBO and IBO heavy weight champion Wladimir Klitschko, left, and his opponent US boxer Eddie Chambers from Philadelphia, Pennsylvania, pose for photographers after a news conference in preparation for their boxing fight in Duesseldorf, western Germany, on Thursday Jan. 28, 2010. The fight will take place on March 20, 2010 at the Esprit Arena in Duesseldorf.

IBF, WBO and IBO heavy weight champion Wladimir Klitschko, left, and his opponent US boxer Eddie Chambers from Philadelphia, Pennsylvania, stand vis-a-vis after a news conference in preparation for their boxing fight in Duesseldorf, western Germany, on Thursday Jan. 28, 2010. The fight will take place on March 20, 2010 at the Esprit Arena in Duesseldorf.

Heavyweight title holder boxer Vladimir Klitschko of Ukraine (L) and Eddy Chambers of the U.S. (R) pose during a news conference in Duesseldorf January 28, 2010. The boxers will fight for the IBF/WBO and IBO world heavyweight championship title on March 20 in Duesseldorf. REUTERS/Ina Fassbender (GERMANY - Tags: SPORT BOXING)

IBF, WBO and IBO heavy weight champion Wladimir Klitschko, left, and his opponent US boxer Eddie Chambers from Philadelphia, Pennsylvania, address the media during a news conference in preparation for their boxing fight in Duesseldorf, western Germany, on Thursday Jan. 28, 2010. The fight will take place on March 20, 2010 at the Esprit Arena in Duesseldorf.

This May 18, 2009, file photo shows Roger Mayweather speaking during a news conference in Los Angeles.(THE ASSOCIATED PRESS/Mark Avery, File)

Britain's David Haye is seen at a press conference in Manchester to announce his forthcoming WBA Heavyweight World Championship boxing fight against John Ruiz of the USA, Manchester, England, Tuesday, Jan. 26, 2010. Haye will fight Ruiz at the MEN Arena in Manchester on April 3, 2010.

Britain's David Haye attends a press conference in Manchester to announce his forthcoming WBA Heavyweight World Championship boxing fight against John Ruiz of the USA, in Manchester, England, Tuesday, Jan. 26, 2010. Haye will fight Ruiz at the MEN Arena in Manchester on April 3, 2010.

Britain's David Haye is seen after a press conference in Manchester to announce his forthcoming WBA Heavyweight World Championship boxing fight against John Ruiz of the USA, Manchester, England, Tuesday, Jan. 26, 2010. Haye will fight Ruiz at the MEN Arena in Manchester on April 3, 2010.

Britain's David Haye is seen at a press conference in Manchester to announce his forthcoming WBA Heavyweight World Championship boxing fight against John Ruiz of the USA, in Manchester, England, Tuesday, Jan. 26, 2010. Haye will fight Ruiz at the MEN Arena in Manchester on April 3, 2010.

World champion boxer Manny “PacMan” Pacquiao stands with a Dallas Cowboy Cheerleader during a news conference January 20, 2010 in New York. The fight between Pacquiao and former world welterweight champion and current No. 1 contender Joshua Clottey is scheduled for March 13, 2010 at Cowboys Stadium in Arlington, TX. AFP PHOTO/DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)