LAS VEGAS – Joseph Duffy barely had time to break a sweat. Mitch Clarke barely had time to realize he was in a fight. But after a solid right hand to start the fight, Duffy (15-2 MMA, 3-1 UFC) pounced on a woozy Clarke (11-4 MMA, 2-4 UFC) and sunk the rear-naked choke to force the submission just 25 seconds into Round 1. The lightweight bout opened up the main card of today’s UFC Fight Night 90 event at MGM Grand Garden Arena in Las Vegas. It streamed on UFC Fight Pass
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