Heavyweight prospect Hasim Rahman Jr. (12-1, 6 KOs) is scheduled to face Youtube star turned boxer, Jake Paul (5-0, 4 KOs), on August 6th at Madison Square Garden in New York City, in the main event of a Showtime Pay-Per-View card.

Recently, Rahman Jr. had some choice words for another Youtuber who turned to boxing - KSI, who has a long-standing rivalry with Paul.

Rahman is coming off his first career defeat back in April, a fifth round stoppage loss to James McKenzie Morrison. He had won every round on all three of the official cards when Morrison caught him in the fifth.

KSI's manager uploaded a video of the knockout loss to Twitter - with KSI giving that post an immediate like.

Rahman explained that he made numerous requests to spar KSI when the two were training side by side at the same gym in Las Vegas, and the once-beaten boxer claims the social media star always refused.

"They can do what they want. KSI would not get in the ring with me, sparring. KSI wouldn't even spar me. So, I mean he can like, he can retweet, he could do whatever he wants," Rahman Jr. told the No Limits Podcast.

"He wanted Viddal to fight me or whatever because he doesn't want to fight me. I've been trying to spar KSI, when he was in Vegas, 'No, he's too big'. I mean, come on man.

"These guys got a lot of kid fans, I'm not no kid. I'm not a KSI fan, I don't care about nothing he liking, I don't care about retweeting or what we got to say. I don't even know who his manager is. They wanna replay me getting dropped 1,000 times, it don't matter.

"You know there's only one heavyweight champion of the world that never hit the canvas? Only one, out of all the heavyweight champions of the world, only one that can say, 'I've never been knocked down'. And that's Vitali Klitschko. Other than that, every other heavyweight champion hit the canvas at one point in time.

"So, I say that to say, it happens, it's boxing, it's the heavyweight division. I was fighting a guy that was 19-0 with 17 knockout, that's a crazy knockout ratio and I was only 12-0. So I took the risk in that fight."