The 20 Biggest Upsets in MMA History
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Frankie Edgar (+725) upsets B.J. Penn (-1100)

Unanimous Decision, Round 5

UFC 112: Invincible — 4/10/2010

Frankie Edgar is currently the only man to appear twice on this list. In both instances, he is the underdog winning and defying the odds. B.J. Penn had always been one of MMA’s biggest underachievers but it had seemed as if he was finally starting to live up to his potential. After a string of dominant title defenses, the UFC’s 155-pound champ appeared unstoppable in the division. There seemed to be no answer to the problem his extremely well rounded game posed. That is, until Edgar came along.

“The Answer” used crisp boxing and smooth footwork to stay competitive with Penn over the course of five rounds and force a close decision. The good majority of MMA fans had the champ retaining his belt in but the judges did not agree. All three awarded the bout to the challenger, including a highly controversial 50-45 score from Doug Crosby. Edgar would go on to silence the critics in a rematch, where he won a deserved 50-45 decision.

Opening line: +525 — 5Dimes

Peak line: +725 — Bookmaker

Closing line: +725 — Bookmaker

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