What happened: Justin Gaethje defeated Ilia Topuria via TKO at the conclusion of the fourth round to secure the undisputed UFC Lightweight Championship. After a grueling four-round battle, Topuria’s corner elected to stop the fight on the stool before the start of the fifth frame.

Why it matters: The victory crowns Gaethje as the undisputed king of the lightweights and hands the previously undefeated Ilia Topuria the first loss of his professional career. Gaethje overcame significant early adversity to dominate the later rounds with his signature relentless pressure.

What to watch: Gaethje will look toward his first title defense while Topuria must regroup following the first setback of his career.