Conor McGregor's long-awaited return to UFC competition ended abruptly when he suffered a knee injury just 69 seconds into his bout with Max Holloway at UFC 329. Attempting high kicks in the opening moments, McGregor appeared to aggravate his knee on the first kick attempt and struggled to maintain stability after briefly rising from the canvas. The referee halted the contest, handing Holloway victory but denying the challenger the definitive rematch he had sought against McGregor from their 2013 encounter.

The defeat extended McGregor's recent struggles, marking his fourth loss in his past five fights with only one win since 2016. His return had drawn scrutiny given multiple controversies, including a 2024 civil case in which he was found liable for assault and an anti-doping suspension for missed drug tests that concluded in March. Despite these questions about his standing, UFC leadership proceeded with the fight, indicating they believed his commercial appeal outweighed concerns about his competitive fitness and behaviour.