Jake Paul has savagely mocked combat sports stars Conor McGregor, Ronda Rousey, and Claressa Shields after the latter was defeated in just her second MMA fight against Abigail Montes on Wednesday night.Shields has been vocal in her disdain for Paul recently, claiming she would “beat him up” if the pair ever met in the ring.Asked if she’d ever want to appear on a Paul undercard, the undisputed lightweight boxing champion said: “Don’t ever disrespect me. I would never fight on the undercard of Jake Paul. I’m a three-division world champion and two-time Olympic gold medallist in boxing.“I could beat up Jake Paul at the weight class I’m at right now. I would never fight on the undercard of someone who does not possess the skills or accomplishments that I have.”Shields then elaborated on why the YouTuber turned boxer has angered her so much.ENTER GIVEAWAY"They’re just giving it to him. They’re like, 'Hey, you’re Jake Paul, you’ve got a million subscribers on YouTube, you and your brother get to fight main event on Showtime."That’s trash. I literally earned my spot and never was given an opportunity. That’s what pi**es me off. It’s not really Jake Paul, it’s more like how dare they give him the opportunity that I earned."I fought the main event on Showtime six times, sold out arenas for Showtime, and still would get the ‘We don’t think you’re big enough to fight on pay-per-view.’ Get out of here. It’s c**p.”But after Shields ended up on the wrong end of a split decision yesterday, Paul took his chance to fire back at the 26-year-old.

Taking to Twitter, the former Vine star tagged Shields in a post and captioned it: “I love karma.”

He went on to congratulate Montes before sharing a savage message, which criticised not only Shields but McGregor and Rousey as well.

Paul has been goading McGregor for months and has repeatedly urged the UFC star to fight him.

“The truth hurts but it’s necessary,” read the post. “[Claressa] Shields is a loser. In MMA, and even more so with her prima donna attitude. The fake always get exposed.

“Losses come when anger and hate take over. Just ask [Ronda] Rousey and [Conor] McGregor. She spent more time berating Jake Paul than learning Jiu Jitsu. She’s never been a big draw and unfortunately for her she never will be.

“Amanda Serrano (the GWOAT) though, has 30 KO’s in 42 fights. 2-0 in MMA, both wins by submission.

“Congrats Abigail Montes on the win.”

While Shields’ unbeaten run in MMA has come to an end, she is still yet to be defeated as a professional in the boxing ring.

The 26-year-old will make her in-ring boxing return on December 11th, live on Sky Sports.