By Radio Rahim

Hall of Fame trainer Freddie Roach detailed the much-talked about sparring session between welterweight prospect Errol Spence and former three division world champion Adrien Broner.

The sparring session took place several years ago, when Spence was still an amateur and Broner was already a name in the making. Spence turned pro in 2012 and signed with manager Al Haymon, who also works with Broner.

As the story goes, and there are many versions of it, at some point during the sparring session Spence knocked Broner out.

Roach has a lot of respect for Spence and considers him a superstar in the making. The veteran coach would even be interested in training Spence (14-0, 11KOs) in the future.

Roach, who says he was physically present during the incident, confirms that Spence drilled Broner. He denies rumors that suggested Broner was down and out, but says the Cincinnati boxer was badly hurt and the sparring session was immediately stopped.

"I think Errol Spence is a future star. I don't know him that well but I was in training camp with him, when I was trying to help out the U.S. Olympic team. He's a very good fighter and he knocked out Adrien Broner in the gym. I was there. He was out, it's not a lie. Broner had no idea where he was. He didn't go down, but he was walking around [out on his feet] and they had to stop it," Roach said .

"Then Broner wanted to finish and they wouldn't let him finish. And then it almost turned into a street fight. I kind of a like Broner, I thought he had a nice side to him at one time, but he turned into an assh*le. Spence knocked him out. I was there. I think he is going to be one of our future stars."