After saying in a text message to ESPN’s Stephen A. Smith that he would consider a rematch with Manny Pacquiao after a unanimous decision victory on May 2, Floyd Mayweather Jr. is now singing a very different tune. Speaking to Jim Gray during an interview that will premiere on SHOWTIME this Saturday night, Mayweather called Pacquiao a “coward” and a “sore loser” before going on to say he has changed his mind about the possibility of that rematch.