Evander Holyfield (R) on his way to stopping Mike Tyson in 1996 (AP)Evander Holyfield has finally decided to give up the ghost of regaining the undisputed heavyweight title and, on his 50th birthday on Friday, will announce his retirement from boxing.

Holyfield told Sports Illustrated that he still believes he can beat heavyweight champions Wladimir and Vitali Klitschko, but said, "I can't make nobody fight."

Few could fight like Holyfield in his prime. He was a fierce competitor who, despite being naturally smaller than many of his opponents, rarely took a backward step. He retires with a 44-10-2 record, along with a no contest, but that mark is deceiving. He was 8-7-1 with a no contest in his last 16 fights, all of which came when he was 37 or older and far past his prime.

"The game's been good to me and I hope I've been good to the game. [...] I'm 50 years old (on Friday) and I've pretty much did everything that I wanted to do in boxing."

In his prime, he was clearly one of the 10 greatest heavyweights ever and one of the most exciting big men to ever enter the ring. He's most known for his 1996 upset of Mike Tyson, but he also scored wins over elite fighters such as Riddick Bowe, George Foreman, Larry Holmes, Ray Mercer, Michael Moorer and Michael Dokes.

Brandon Rios (R) lands a right on Mike Alvarado in the seventh round on Saturday. (Chris Farina/Top Rank)Less than 30 seconds into their epic super lightweight bout Saturday at the Home Depot Center in Carson, Calif., Brandon Rios had already connected with a crackling double left hook, and Alvarado had returned fire with a blazing right hand.

Throughout the nearly 20 minutes they pummeled each other, the pace rarely slowed. They each delivered bone-crushing shots in a battle that ended dramatically with Rios swarming Alvarado on the ropes in the seventh round.

Referee Pat Russell jumped in to save Alvarado from further punishment as he went defenseless along the ropes. When the fight ended, many were saying it was the greatest bout of the 21st century.

Since the 21st century didn't begin until Jan. 1, 2001, I'll include the Year 2000 as I pick my Baker's dozen of the greatest matches of the 2000s.

13. Antonio Margarito TKO11 Miguel Cotto, July 26, 2008, Las Vegas: The match was billed as "The Battle," but it was more like a war. The welterweights went at each other in savage fashion from the opening bell. The bout later became infamous when Cotto began to believe that Margarito's hand wraps were loaded, but that has never been proven. It was, however, one of the most entertaining fights ever to watch.

Amir Khan (R) and his younger brother fought off six men trying to steal his car (AP)Boxer Amir Khan's chin has been called into question lately, but not his fighting spirit. The former world champion proved that, along with his younger brother Haroon, when they fended off six would-be car thieves in Birmingham, England, Monday.

According to The Sun, a group of six men attempted to strong arm the Khans and steal Amir's Range Rover. The newspaper put the value of the vehicle at more than £100,000.

Khan has lost back-to-back fights and was knocked out by Danny Garcia in Las Vegas in the fourth round of their July 14 match at Mandalay Bay for the WBA/WBC super lightweight title.

Khan believed part of his problem in that bout was that his fighting spirit was too great and he wound up fighting Garcia's match.