By Edward Chaykovsky

We knew it would happen sooner or later. During a detailed interview with USA Today, trainer Freddie Roach took shots at Floyd Mayweather Jr.'s controversial past with domestic violence.

On May 2nd at the MGM Grand in Las Vegas, Roach's star fighter Manny Pacquiao will face Mayweather in a WBC/WBA/WBO welterweight mega-unification from the MGM Grand in Las Vegas.

Mayweather has been under the gun several times over alleged assaults. In 2012, he spent two months in a Las Vegas detention facility for a physical altercation involving Josie Harris, mother to three of his four children.

"Manny is really against domestic violence," Roach said to Martin Rogers of USA Today. "It is a big issue maybe in the Philippines for him and being a congressman he can control some of that stuff. That is a big plus for me that Manny does not like the guy, I think the killer instinct is going to come back a lot faster."

According to Roach, Mayweather's antics outside of the ring have only fueled Pacquiao's fire to get the victory.

"It is really hard to say these things in public but I know (Mayweather) is a bad guy," Roach said. "(I see the fight as) good against evil, yes. I have even thought about bringing a couple of the metro cops from Vegas in to tell Manny how many times (Mayweather) has been arrested and how bad of a guy he is, but I decided I can't go that far. He already doesn't like him, I think we are okay. For the first time in my life with Manny Pacquiao, this is the first fighter he hasn't liked. I can tell."