By Edward Chaykovsky

Hall of Fame trainer Freddie Roach detailed the bad blood that exists between himself and the Mayweather family. According to Roach, the mutual dislike spans several decades.

The tension first began many years ago, when Roach and Roger Mayweather were still active fighters. Roach explained an incident in the gym, which began the years of bad blood, between him and Roger.

"I trained in the same gym with them. I’ve known Floyd since he was five years old, he grew up in the gym, he just learned how to fight on his own. He was born in the boxing gym. Roger was in the gym some times and me and Roger sparred one time and he wasn’t a big puncher when he first came out, when he was 126-pounds and I was 122-pounds," Roach told On The Ropes Boxing Radio .

"We sparred four rounds and I don’t think I hit him once and I think he hit me a couple of times but he just ran all night long. The next day he asked me if I wanted to spar again and I said, “No, I already did my roadwork this morning.” He got mad at me and we’ve never been friends since."

On May 2nd at the MGM Grand in Las Vegas, Roach's star fighter - Manny Pacquiao - will face Roger's nephew, Floyd Mayweather Jr.

For most of Floyd's high level success, Roger has been the head trainer. For the fight in May, Roger will step aside due to health issues and Floyd Mayweather Sr. will work the corner as head trainer.

"There’s dislike between us, they’re not my favorite people but I like that the dad is in the corner and not Roger because the dad gets stutters and gets really excited and he really has trouble getting the information to his fighter out. I think it’s a plus for us and I think Roger is the better trainer because he’s been there longer, that’s just my opinion at this point," Roach said.