Timothy Bradley didn't hold back when he sat down with Manny Pacquiao on HBO's Face Off Saturday and seemed certain that he will be the winner of their upcoming fight.

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The two boxers will step into the ring for the second time on April 12 at the MGM Grand in Las Vegas. Bradley and Pacquaio first fought on June 9, 2012 and Bradley won by a split-decision creating one of the most controversial matches in history.

Bradley, who said he believes he won their previous fight 8-4, explained why Pacquiao won't defeat him in April.

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"Manny, the only way that you're going to beat me, you've got to knock me out," Bradley told the Filipino boxer during their sit-down interview. "If you don't knock me out, Manny, you're not gonna win. I'm telling you that right now."

Pacquiao fired back and said that he plans to "throw a lot of punches" and added that he knows he has a lot to prove this time around. However, Bradley insisted that Pacquiao has changed and doesn't fight with the same aggression he once did.

"That hunger that he's looking for, it's no longer there and he can't get it back," Bradley said. "It's gone."

Pacquiao, who turned 35 in December, disagreed with his opponent saying that the fire in him is still present. He also took a jab at Bradley's confidence.

"My time is not finished yet. My time is not done yet. I can say that," Pacquiao said. "And one thing that I can say to us and to all the fighters: Those who humble themselves will be exalted and those who are exalted will be humbled."