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MASHANTUCKET, CT - SEPTEMBER 05:  (L-R) Matt Mitrione knocks out Derrick Lewis as referee Mario Yamasaki calls the fight in their heavyweight bout during the UFC Fight Night event at Foxwoods Resort Casino on September 5, 2014 in Mashantucket, Connecticut.  (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
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MASHANTUCKET, CT - SEPTEMBER 05: (L-R) Matt Mitrione knocks out Derrick Lewis as referee Mario Yamasaki calls the fight in their heavyweight bout during the UFC Fight Night event at Foxwoods Resort Casino on September 5, 2014 in Mashantucket, Connecticut. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)