A new rivalry has erupted, between YouTube star Jake Paul and cruiserweight prospect Tommy Fury, who is the younger brother of WBC heavyweight champion Tyson Fury.

Tommy Fury was in action last Saturday night, when he blasted out Scott Williams in two rounds to raise his record to 5-0, with four knockouts.

Paul, who is 2-0 as a pro boxer, will have his third fight in April when he faces former UFC fighter Ben Askren.

Tyson Fury recently called on Paul to fight younger brother Tommy.

Paul was completely caught off-guard by Tyson's comments.

"I wake up, and I see Tyson Fury, the heavyweight champ, Tweets me and he was talking sh-- about Canelo too, saying it was boring and nobody was watching. So I was laughing along with it. Then I get to the bottom of the Tweet and he’s calling me out to like fight someone, and the Tweet is about his brother," Paul said.

“Oh, I didn’t even know he had a brother. Then he’s calling me out to fight his brother, and I’m like, ‘Bro, what the f--- is going on here?’

“I didn’t know Tyson Fury had a bro? I like Tyson Fury. I don’t want a beef with Tyson Fury, but damn, if Tyson Fury took a s---, it would be his little brother. He’s literally like this little kid. My point is here. You’re Tyson Fury’s little brother. If you want to fight me, don’t let your big bro do s--- for you. Log in to Instagram or Twitter and call me out for yourself, bro. What’s going on in this boxing world?”

And of course, Tommy Fury fired back at the statements from Paul.

"So, I see somebody is having a little bit of something to say,” Tommy Fury said.

"Mr. Jake Paul, I don’t need anybody to do my dirty work, I’m calling you out myself right now. You can fight me any time, any place, anywhere. All you’ve got to do is get in touch."