Justin Gaethje secured one of the greatest upsets in MMA history by defeating Ilia Topuria in the main event of UFC White House.Both lightweight stars exchanged heavy leather over four rounds, but Gaethje left Topuria busted up, bloodied and bruised with his jab and deadly right hand.Topuria pleaded with the doctor to let him continue until a member of his team stopped the fightGettyGaethje was written off by many of the biggest stars in MMA, but is now the new UFC lightweight championGettyThe new champion celebrated in style after his iconic victoryGettyAfter four rounds of all-out action, Gaethje eventually forced ‘El Matador’ to retire on his stool to become the new champion.Topuria’s face was a mess as he sat in his corner during the championship rounds, before a member of his team informed the officials to stop the fight.Gaethje reacts to historic White House win“I cannot believe it,” Gaethje told Joe Rogan, who called the fight ‘one of the greatest upsets in the history of the sport,’ after his monumental victory.“I knew I was going to have to get through the first round. His skills are unmatched when he’s fresh.“But my durability, my tenacity and my heart will carry me through those first couple of rounds, and no one can outwork me in rounds three, and especially in the championship rounds.”Topuria vs Gaethje – how it unfoldedBoth men traded heavy blows in an electric start to the fight.Topuria hunted Gaethje from the opening bell, going straight into his boxing-heavy stance, unloading with right hands.Gaethje was bringing Topuria into the clinch, delivering well-timed uppercuts that had Topuria’s right eye bloodied and swollen.Topuria, too, had his moments, landing a strong left hook, but Gaethje kept responding, popping ‘El Matador’ with his jab and the two lightweights were already engaged in a war after five minutes.Topuria got the better of Gaethje in the second, punishing ‘The Highlight’ to the body with his perfect left hook that couldn’t seem to miss.View Tweet: https://t.co/jqeZUh6OneThe champion had Gaethje pressed against the fence and dropped him with another brutal body shot straight to the liver.Gaethje dropped to the canvas, and Topuria almost locked in a series of different submissions, but the challenger rode it out, and the fight entered round three.The third round brought out a side of Topuria we’ve never seen before.The champion had emerged looking a little lethargic, and moments later, he was flattened.Gaethje found the target again with his jab and followed up with a huge right hand that left Topuria in danger.Topuria was seriously beaten up as Gaethje nearly locked in a D’Arce choke on the canvas, but ‘El Matador’ somehow made it out alive.The doctor was called over to Topuria’s corner during the break, and incredibly, almost stopped the fight.After an assessment, the doctor told referee Marc Goddard to stop the fight, but Topuria, who was caught telling his corner he couldn’t see out of his right eye, pleaded with the officials and the fight went on.It was the most dramatic of circumstances as the fight entered the championship rounds.After both men got an extra minute of rest due to the doctor’s assessment, the swelling on Topuria’s right eye was crazy as the fight continued to round four.Gaethje cracked Topuria with a flying knee and kept punishing him in all departments.Topuria managed to drag ‘The Highlight’ to the canvas and was all of a sudden having his best spell of the main event.However, Gaethje managed to reverse Topuria on the canvas, and the challenger finished the round on top with brutal ground and pound.Both fighters walked back to their stools, and Topuria looked completely deflated and exhausted.After a tense wait as the champion sat slumped surrounded by his team, Goddard then signalled the fight was over.A member of Topuria’s corner has essentially thrown in the towel, crowning Gaethje the new UFC lightweight champion.US President Donald Trump and UFC CEO Dana White then entered the Octagon as a spectacular fireworks display closed the historic evening.