WBC/WBA welterweight champion Floyd Mayweather Jr. finally broke his silence when he appeared on a special Friday edition of Showtime Championship Boxing and lashed out at his division rival, WBO welterweight champion Manny Pacquiao, and the Filpino star's promoter Bob Arum of Top Rank. Pacquiao wants to face Mayweather in 2015. Mayweather said he was open to the challenge, for the Cinco De Mayo date of May 2nd.