After an incredible knockout victory over Manny Pacquiao in his most recent fight in December, Juan Manuel Marquez knows that the past is the past.
Marquez (55-6-1, 40 KOs), a four-time world champion, will try to earn his fifth title Saturday night (HBO PPV, 9 p.m. ET) at the Thomas & Mack Center in Las Vegas, where he faces welterweight titlist Timothy Bradley in a 12-round bout.
A defeat against Bradley (30-0, 12 KOs) could bring the end to the long career of Marquez, but a victory would make him the only Mexican fighter to win world titles in five different divisions.
Here are five keys to victory for Marquez against Bradley: