David Haye and Dereck Chisora promised the knockout loser of their non-world title fight on Saturday will donate $31,000 to charity.

At a joint news conference on Wednesday, where the bitter British rivals were separated by a metal fence, one of the only two things they agreed on was helping out charities if one or the other is knocked out at Upton Park.

Chisora picked a children's hospital, and Haye chose a bone marrow charity for minorities.

The also agreed to blood testing for doping, if asked.

Otherwise, the hype flowed freely between the boxers, who have attracted 29,000 spectators for a fight that hasn't sold out.