Chris Hyde/GettyManny Pacquiao wants a rematch with Floyd Mayweather, but before that can happen, he needs to go through Jeff Horn. Pacquiao and Horn, a 29-year-old Aussie with an undefeated record, will square off this Saturday at Brisbane's Suncorp Stadium. At 38, Pacquiao remains one of the biggest names in the sport, but his trainer, Freddie Roach, says that he'll need to be on his game if he wants another shot at his longtime rival. "He wants a rematch with Mayweather," Roach told Sky News.