With promoter Floyd Mayweather in his ear hyping him up -- both were dressed in threads Michael Jackson would've been proud of -- junior lightweight titlist Gervonta Davis entered the ring in London to the song "Beat It" on Saturday.  

The choice of entrance music proved apropos. 

Davis, just 22, made the first defense of his IBF title and continued to showcase just how dangerous of a finisher he is with a third-round TKO of Great Britain's Liam Walsh at Copper Box Arena. 

In a showdown between unbeaten southpaws, Davis (19-0, 18 KOs) looked supremely confident despite operating in enemy territory. The Baltimore native was quick, accurate and powerful in dispatching Walsh (21-1, 14 KOs), despite a questionable stoppage from referee Michael Alexander that left the crowd booing. 

"[Davis] had a great night, he looked brilliant and I give him an A-plus," Mayweather said. 

Davis, nicknamed "Tank," is undoubtedly the brightest prospect to ever come out of the Mayweather Promotions stable, which also includes super middleweight titleholder Badou Jack. 

After a pair of close rounds to open Saturday's fight, it didn't take Davis long to bring an end to the fight in Round 3. Davis connected with two short left hands from the clinch to visibly hurt Walsh and instantly jumped all over him with power shots along the ropes. 

A three-punch combo, which ended with a short left hand, sent Walsh to the canvas. After he reached his feet, Davis poured it on with more clean shots. But Alexander jumped in to save Walsh from further punishment at 2:11 of the round, in what felt like a quick stoppage that Walsh protested. 

"Today, the performance was great," said Davis, who impressively stopped Jose Pedraza in January to win his 130-pound title. 

"I thought that it was going to take a couple more rounds for him to get the guy out of there, but I take my hat off to Liam Walsh, he was a tough competitor," Mayweather said. "I'm proud of 'Tank.' I want him to keep up the good work and keep working hard and he'll be back in the ring in a few months. We just want to take one fight at a time. There's no rush."

Mayweather, 40, who retired following his September 2015 victory over Andre Berto with a record of 49-0, was asked for an update on whether a boxing match against UFC champion Conor McGregor would come to fruition.

"If me and Conor McGregor do happen to make the fight happen, and I think that the fight will happen, I would love for this young kid [Davis] to be on the undercard," Mayweather said. "I would also like Badou Jack to be on the undercard. But tonight is Tank's night. Let's talk about him. 

"He did a great job and a tremendous job. I had a great career and my career may not be over. No. 50 may be against Conor McGregor but we'll just have to wait and see."