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#4 Matt Serra
The biggest moment in Matt Serra’s career came when he knocked out Georges St. Pierre at UFC 69 to become the UFC Welterweight champion. This win still stands out as one of the biggest upsets in UFC history and rightfully so.
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And since it was a big upset, everyone thought that Serra would go on to become a solid champion. However, his run with the Welterweight championship didn’t last long.
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In his first title defence, Serra lost the title to Georges St. Pierre at UFC 83. This fight marked the start of GSP’s dominant run as the Welterweight champion.
As for Serra, he only fought three times after dropping the title. And out of these three fights, he lost two, the second of which was his last fight in the octagon.
