Ethan Hooper
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Since Holly Holm just defeated Ronda Rousey in a major upset, I figured I would start this thread. I searched for a thread on this and didn't find anything, so I apologize if there is one already. What is the biggest upset in sports that you can recall. I'm only twenty-one so I won't remember as many as some of you, but the biggest in my life is probably the Giants beating the undefeated Patriots in the Super Bowl a few years back.