Whicker: Manny Pacquiao's win Saturday rekindles talk of rematch with Floyd Mayweather

LAS VEGAS ? Six months ago, a joker showed up at Wild Card Gym. Floyd Mayweather Jr. came to the Vine Street shrine without his usual NFL offensive line of bodyguards, without cameras or sycophants. ?He was very nice, very polite,? said Freddie Roach. Mayweather said he was franchising his own gym and wanted to see how Wild Card did it. ?I also thought he was looking for Manny Pacquiao,? Roach said. On Saturday night at Thomas & Mack Center, Pacquiao took Jessie Vargas? WBO welterweight title by…