By Edward Chaykovsky & Ryan Burton

Trainer Floyd Mayweather Sr. says eight division world champion Manny Pacquiao (54-5-2, 38KOs) is finished if he loses on November 23rd in Macau, China. In his first fight since getting knocked out last December by Juan Manuel Marquez in the sixth round, the Filipino star will face Brandon Rios (31-1-1, 23KOs). If Pacquiao doesn't win, it would mark his third consecutive defeat and likely the end of his career. Pacquiao's trainer Freddie Roach will ask him to retire if he's unable to overcome Rios in November.

"Maybe he will bounce back with Brandon Rios or he might not. But I'll tell you this, he will never beat the elite guys like Floyd," Mayweather Sr. said. "I'll be honest with you, I don't even know who the hell Rios is. I have never seen Rios or heard of him before. I can' tell you that I've seen him [fight] before, so I don't what kind of fighter he is, but I know if Pacquiao gets clipped or knocked down - it's pretty much over for him."