Manny Pacquiao vs. Floyd Mayweather Jr.

Manny Pacquiao has signed a contract to fight Floyd Mayweather Jr. in boxing's biggest fight on March 13, a source with knowledge of the meeting told ESPN.com on Friday night. Mayweather had previously agreed to terms with Golden Boy Promotions, his promoter for the HBO PPV fight, but it was unclear if he had signed a contract. The fight will take place at the welterweight limit of 147 pounds for Pacquiao's title and match the top two fighters in the world, pound-for-pound. Both camps agreed to a 50-50 split of the money, which could be gargantuan. Many experts expect the fight to eclipse the all-time pay-per-view record for sales, which are the 2.44 million buys generated by Mayweather's 2007 victory against Oscar De La Hoya. The fight is going to take place March 13 because Pacquiao is running for a congressional seat in Sarangani, Philippines and the elections are in May, which would have been a conflict between his training and the campaign.