Upset Alert! The 10 Biggest Shocks in UFC History

Matt Serra vs. Georges St-Pierre

Julianna Peña vs. Amanda Nunes

TJ Dillashaw vs. Renan Barao

Holly Holm vs. Ronda Rousey

Chris Weidman vs. Anderson Silva

Sean Strickland vs. Israel Adesanya

Michael Bisping vs. Luke Rockhold

Rose Namajunas vs. Joanna Jedrzejczyk

Frankie Edgar vs. BJ Penn

Shana Dobson vs. Mariya Agapova