Justin Gaethje's UFC 300 Win Shocks Anthony Joshua: 'The Fight Game Is Serious'

Justin Gaethje’s dominant win over Ilia Topuria at UFC 300 sent shockwaves through the MMA world-and even reached boxing’s Anthony Joshua. The former heavyweight champion admitted Gaethje’s victory made him reassess his own approach to fighting, calling the sport 'serious business.'

What happened at UFC 300?

Gaethje delivered one of the biggest upsets in UFC history, dismantling Topuria over four rounds to claim the undisputed lightweight title. The fight, held on April 13, 2024, shattered Topuria’s undefeated record and ended his reign as one of MMA’s most dominant fighters. Gaethje’s relentless pressure and striking proved too much for the previously invincible Topuria.

Why it matters for Justin Gaethje

This victory cemented Gaethje’s legacy as one of the most exciting fighters in UFC history. At 35, he defied expectations by not only beating a younger, undefeated champion but doing so in spectacular fashion. The win also positioned him as a top contender in the lightweight division, with potential matchups against other elite fighters on the horizon.

How Anthony Joshua reacted

Joshua, who has faced his own ups and downs in boxing, was deeply affected by Topuria’s loss. He told *Combat Evolved* that watching the fight made him realize the gravity of professional combat sports. 'It’s not all fun and games,' Joshua said. 'I saw someone in Ilia who was destined to win, but Justin proved otherwise. It’s a serious job.'

Joshua drew parallels between Topuria’s loss and his own shocking defeat to Andy Ruiz Jr. in 2019. Both fighters were seen as unstoppable before their unexpected losses. Joshua now plans to focus more intensely on his craft, surrounding himself with people who understand the demands of fighting.

What’s next for Justin Gaethje?

With the lightweight title now in his possession, Gaethje’s next move is highly anticipated. Potential opponents include rising stars like Islam Makhachev or a rematch with Dustin Poirier. Whatever comes next, Gaethje has proven he’s still at the top of his game.

Meanwhile, Joshua prepares for his July 25 fight against Kristian Prenga, a bout he sees as a stepping stone toward a potential showdown with Tyson Fury later this year. Both fighters now carry the weight of Gaethje’s lesson: in combat sports, nothing is ever guaranteed.