Conor McGregor's return at UFC 329 ended seconds in when he tore his right ACL and meniscus attempting a flying kick against Max Holloway. It marked the second consecutive McGregor fight halted by non-contact injury, following his 2021 broken tibia and fibula against Dustin Poirier.

This bookends a five-year trend of anticlimactic UFC finishes. At UFC 323, champion Alexandre Pantoja injured his elbow 26 seconds into a title bout against Joshua Van. At UFC 321, Tom Aspinall vs. Ciryl Gane ended in a no-contest after an incidental eye poke left Aspinall unable to continue.

Other disappointments include a May 2025 women's flyweight co-main event canceled moments before walkouts due to Maycee Barber's medical emergency, and the 2023 Noche UFC main event where Alexa Grasso vs. Valentina Shevchenko 2 concluded in a split draw after five rounds.