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1
- Serra vs. St-Pierre I
- Matt Serra | KO/TKO | Round 1
- 2007 | UFC 69
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GSP a -1000 favorite. Serra a +700 underdog. Not only have I never seen an upset victory with those kinda odds. The last fight that I remember that was close to those odds was Cyborg Santos vs. Jan Finney.
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2
- Gonzaga vs. Filipović
- Gabriel Gonzaga | KO/TKO | Round 1
- 2007 | UFC 70
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That foot rotating like that still comes up in my nightmares every so often.
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3
- Randleman vs. Filipović I
- Kevin Randleman | KO/TKO | Round 1
- 2004 | Pride Total Elimination 2004
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In the rematch Mirko Cro Cop put Randleman in a guillotine choke. That's all I'm gonna say because I love Kevin Randleman.
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4
- Griffin vs. Rua I
- Forrest Griffin | Submission | Round 3
- 2007 | UFC 76
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As much as I love and cheered for Shogun in the rematch, I never understood why they would take the chance in watering down (So to speak) one of the most classic moments in UFC history.
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5
- Diaz vs. Gomi
- Fight Ends in a No Contest
- 2007 | Pride 33
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Marijuana. Enough said.
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6
- Ortiz vs. Bader
- Tito Ortiz | Submission | Round 1
- 2011 | UFC 132
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Most shocked I've ever been in a long time (well since Kongo vs. Barry the week before). To me this will most likely be Tito's swan song. But at a time in my life where my interest in MMA was on the decline, Tito Ortiz re-established why I've love this sport so much.
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7
- Emelianenko vs. Werdum
- Fabrício Werdum | Submission | Round 1
- 2010 | Strikeforce
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The beginning of the end for one of the greatest MMA fighters of all time.
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8
- Lauzon vs. Pulver
- Joe Lauzon | KO/TKO | Round 1
- 2006 | UFC 63
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The Ultimate Fighter 8, that is all.
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9
- Slice vs. Petruzelli
- Seth Petruzelli | KO/TKO | Round 1
- 2008 | EliteXC
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Not really an upset in most hardcore MMA fans eyes. But Gus Johnson says it's the biggest upset of all time...yeah Gus Johnson, from what i hear he might be doing something with the UFC being of Fox Pre and Post fight show. God help us all.
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10
- Silva vs. Sonnen
- Anderson Silva | Submission | Round 5
- 2010 | UFC 117
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I understand Anderson was the favorite, but what Sonnen was able to do to the best fighter in the world was just as shocking and worthy of the number 10 upset regardless of the outcome of the fight.