Manny Pacquiao Should Retire If Knocked Out By Brandon Rios, Says Trainer Freddie Roach, After Defeats Vs. Timothy Bradley, Juan Manuel Marquez [VIDEO]

Manny Pacquiao, once considered the pound-for-pound equal of welterweight champion Floyd Mayweather Jr., has dropped his last two fights, and if he is knocked out by Brandon Rios on November 24th, his trainer Freddie Roach believes retirement will follow.