3. Brock Lesnar vs. Junior Dos Santos
Event: UFC 131 Here's another event where Shane Carwin came into play, and another event that was to be a coach's fight from a TUF season. TUF 13 back in 2011 was to have one of the most anticipated heavyweight fights in years with JDS vs Brock Lesnar fighting for a shot at Cain Velasquez's heavyweight title. Lesnar had lost the belt to Cain and wanted it back, JDS was the biggest threat to Cain's dominance in the division. It should have been a classic battle of monster heavyweights. Instead, Lesnar's diverticulitis flared up again, and he had to drop out of the fight. He would later have surgery and have a foot of colon removed; Carwin, meanwhile, stepped in and took the fight at UFC 131, only to be badly beaten by JDS in what would be Carwin's last fight. JDS would go on to knock out Cain Velasquez, starting off the trilogy of fights between them, and Lesnar would never hold gold again.