Justin Gaethje captured the undisputed UFC lightweight championship on Sunday night after wearing down Ilia Topuria and forcing the previously unbeaten star to retire on his stool following four punishing rounds at UFC Freedom 250 at the White House.

Topuria (17-1 MMA, 9-1 UFC) entered the bout riding a wave of momentum after his dominant runs through the featherweight and lightweight divisions, but Gaethje's relentless pace and durability ultimately proved too much to overcome.

The challenger had moments of success early, particularly with his body attack. Gaethje (28-5 MMA, 11-5 UFC) admitted afterward that Topuria's offense caused significant damage throughout the contest.

“Yeah, he's very good. I mean, my liver still hurts right now,” Gaethje told reporters at the UFC Freedom 250 post-fight press conference. “The body shots were crazy. (He) was really, really fast, but when he didn't get the finish at the end of the second round, I think it really took his spirit.”

According to Gaethje, the turning point came when Topuria failed to capitalize on his early success. As the fight moved into the later rounds, the veteran contender believed the pressure began to mount on the Spanish Georgian champion.

Gaethje pointed to comments Topuria made during fight week, when he predicted a dominant victory, and said those expectations may have worked against him once adversity set in.

“And, you know, again, I said it in the press conference leading up,” Gaethje said. “He really backed himself into a corner, saying he's going to be so dominant. And I said it. When we go to the second round, you're going to be like, what the f**k? When we go to the third round, you're going to be like, what the f**k? And, you know, that's what I did tonight.”

With the victory, Gaethje adds the undisputed lightweight title to his résumé and hands Topuria the first defeat of his UFC career. The result also reinforces Gaethje's long-standing reputation as one of the sport's most durable and dangerous competitors, capable of dragging opponents into grueling battles that test both their conditioning and resolve.

After surviving Topuria's early surge, Gaethje did exactly that, breaking the former champion over the course of four exhausting rounds before securing the biggest win of his career.