Floyd Mayweather Jr. challenges Manny Pacquiao to sign contract Found 5 hours ago on NESN.com: Via NESN: Floyd Mayweather Jr. has turned the tables on the Mayweather-Pacquiao storyline, challenging those that have called him out for ducking Manny Pacquiao. Mayweather has booked the MGM Grand in Las Vegas for his next fight on May 5, saying he wants to make it against a great opponent. At first, the allusions to Pacquiao had been vague, only saying he wants to fight the "little guy." There is no more niceties now. Mayweather has come out with a video directly challenging Pacquiao to "sign the contract" and "stop ducking." Mayweather Jr. also called out Pacquiao, saying he's lost all three fights against Juan Manuel Marquez. Mayweather appears motivated to challenge Pacquiao after his latest controversial fight with the Mexican boxer. The more these fights and negotiations endure the more it seems the megafight the boxing world is waiting for is all about Bob Arum and Mayweather Jr. The recent escalation from Mayweather Jr. comes just weeks after Arum said there would be no fight because Mayweather Jr. is too scared to make it happen. It seems, through all of this, Pacquiao would be willing to take the blood tests that have delayed previous fights, but after seeing the damage a victory has done for Pacquiao in destroying his public persona, what would a possible loss to Mayweather do not just for Pacquiao's career but that of Freddie Roach and Arum? Much like Canelo Alvarez thinking he's worthy of Mayweather after many fights against inferior opponents, Pacquiao seems to be another fighter believing the praise that comes his way. Only the fight will prove which fighter is truly the best, and which is a public relations creation, and for now, the ball is in Pacquiao's court.