Serbian tennis star Ana Ivanovic

MONTREAL - AUGUST 9: Ana Ivanovic of Serbia serves to Roberta Vinci of Italy during round two of the Rogers Cup at the Uniprix Stadium on August 9, 2012 in Montreal, Quebec, Canada. (Photo by Robert Laberge/Getty Images)

MONTREAL - AUGUST 9: Ana Ivanovic of Serbia returns the ball to Roberta Vinci of Italy during round two of the Rogers Cup at the Uniprix Stadium on August 9, 2012 in Montreal, Quebec, Canada. (Photo by Robert Laberge/Getty Images)

LONDON, ENGLAND - AUGUST 01: Ana Ivanovic of Serbia looks on against Kim Clijsters of Belgium on Day 5 of the London 2012 Olympic Games at Wimbledon on August 1, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - JULY 30: Ana Ivanovic of Serbia celebrates match point during the Women's Singles Tennis match against Elena Baltacha of Great Britain on Day 3 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club in Wimbledon on July 30, 2012 in London, England. (Photo by Jamie Squire/Getty Images)

LONDON, ENGLAND - JULY 28: Ana Ivanovic of Serbia returns a shot against Christina Mchale of the United States on Day 1 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club in Wimbledon on July 28, 2012 in London, England. (Photo by Phil Walter/Getty Images)

LONDON, ENGLAND - JULY 02: Ana Ivanovic of Serbia returns the ball during her Ladies' singles fourth round match against Victoria Azarenka of Belarus on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 2, 2012 in London, England. (Photo by Clive Rose/Getty Images)

LONDON, ENGLAND - JULY 26: Ana Ivanovic of Serbia smiles during the practice session ahead of the 2012 London Olympic Games at the All England Lawn Tennis and Croquet Club in Wimbledon on July 26, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - JUNE 21: Ana Ivanovic arrives at the WTA Tour Pre-Wimbledon Party at The Roof Gardens, Kensington on June 21, 2012 in London, England. (Photo by Tom Dulat/Getty Images for WTA)

LONDON, ENGLAND - JUNE 27: Ana Ivanovic of Serbia celebrates match point during her ladies singles first round match against Maria Jose Martinez Sanchez of Spain on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England. (Photo by Clive Rose/Getty Images)

LONDON, ENGLAND - JUNE 30: Ana Ivanovic of Serbia returns a s shot during her Ladies' Singles third round match against Julia Goerges of Germany on day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on June 30, 2012 in London, England. (Photo by Julian Finney/Getty Images)

LONDON, ENGLAND - JUNE 28: Ana Ivanovic of Serbia reacts during her Ladies' Singles second round match against Kateryna Bondarenko of the Ukraine on day four of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 28, 2012 in London, England. (Photo by Julian Finney/Getty Images)

Serbia's Ana Ivanovic reacts after winning first set to Italy's Sara Errani hits a return to during their Women's Singles 3rd Round tennis match of the French Open tennis tournament at the Roland Garros stadium, on June 1, 2012 in Paris. AFP PHOTO / PASCAL GUYOTPASCAL GUYOT/AFP/GettyImages

Serbia's Ana Ivanovic reacts after winning first set to Italy's Sara Errani hits a return to during their Women's Singles 3rd Round tennis match of the French Open tennis tournament at the Roland Garros stadium, on June 1, 2012 in Paris. AFP PHOTO / PASCAL GUYOTPASCAL GUYOT/AFP/GettyImages

PARIS, FRANCE - JUNE 01: Ana Ivanovic of Serbia returns during her women's singles third round match against Sara Errani of Italy during day six of the French Open at Roland Garros on June 1, 2012 in Paris, France. (Photo by Matthew Stockman/Getty Images)

KEY BISCAYNE, FL - MARCH 25: Ana Ivanovic of Serbia celebrates winning her match against Daniela Hantuchova of Slovakia during day 7 of the Sony Ericsson Open at Crandon Park Tennis Center on March 25, 2012 in Key Biscayne, Florida. (Photo by Michael Regan/Getty Images)

KEY BISCAYNE, FL - MARCH 26: Ana Ivanovic of Serbia reacts to a lost point against Venus Williams of the USA during Day 8 at Crandon Park Tennis Center at the Sony Ericsson Open on March 26, 2012 in Key Biscayne, Florida. (Photo by Al Bello/Getty Images)

PARIS, FRANCE - MAY 27: Ana Ivanovic of Serbia celebrates a point during the women's singles first round match between Ana Ivanovic of Serbia and Lara Arrubarrena-Vecino of Spain on day one of the French Open at Roland Garros on May 27, 2012 in Paris, France. (Photo by Matthew Stockman/Getty Images)

Ana Ivanovic of Serbia reacts during the International Tennis Federation Fed Cup semi-final match against Russia's Svetlana Kuznetsova in Moscow, on April 21, 2012. Kuznetsova won 2-1. AFP PHOTO / NATALIA KOLESNIKOVA (Photo credit should read NATALIA KOLESNIKOVA/AFP/Getty Images)

Ana Ivanovic of Serbia returns to Russia's Svetlana Kuznetsova during the International Tennis Federation Fed Cup semi-final match between Russia and Serbia in Moscow, on April 21, 2012. Kuznetsova won 2-1. AFP PHOTO / NATALIA KOLESNIKOVA (Photo credit should read NATALIA KOLESNIKOVA/AFP/Getty Images)

Ana Ivanovic of Serbia reacts during the International Tennis Federation Fed Cup semi-final match against Russia's Svetlana Kuznetsova in Moscow, on April 21, 2012. Kuznetsova won 2-1. AFP PHOTO / NATALIA KOLESNIKOVA

Ana Ivanovic of Serbia returns the ball to Maria Kirilenko of Russia during their Dubai WTA tennis Championships match in the Gulf emirate on February 22, 2012. AFP PHOTO/KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty Images)