Manny Pacquiao's trainer says his boxer is especially motivated to beat Floyd Mayweather because of the American's history of domestic violence.
"Manny is really against domestic violence," Freddie Roach told USA Today on Tuesday. "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."
Pacquiao and Mayweather are scheduled to fight on May 2 at the MGM Grand in Las Vegas.
Mayweather has a checkered past that includes multiple brushes with the law. He was incarcerated in Las Vegas for two months in 2012 for a misdemeanor domestic battery case, in which Mayweather engaged in a hair-pulling, arm-twisting attack on his former girlfriend, Josie Harris, while two of their three children watched.
"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 OK.
"For the first time in my life with Manny Pacquiao, this is the first fighter he hasn't liked. I can tell."