Heavyweight British boxers David Haye, left, and Dereck Chisora come head to head with a piece of metal fencing between them after a press conference, ahead of their fight in London, Wednesday, July ... more 

Heavyweight British boxers David Haye, left, and Dereck Chisora come head to head with a piece of metal fencing between them after a press conference, ahead of their fight in London, Wednesday, July 11, 2012. The two boxers are due to fight each other in a 12-round bout on Saturday at West Ham United football club's Upton Park stadium in London. Haye and Chisora infamously traded blows at a press conference following Chisora's loss to Vitali Klitschko in Munich in February, leading to the British Boxing Board of Control stripping Chisora of his license. Haye was unlicensed because he had retired. (AP Photo/Matt Dunham) less