Dustin Poirier stuns Conor McGregor with second-round TKO at UFC 257 play Poirier, McGregor exchange blows in first two rounds (0:47) Dustin Poirier and Conor McGregor go back and forth in Round 1, but it's all Poirier in Round 2 as he pulls out the stunning victory. (0:47) Dustin Poirier avenged his loss to Conor McGregor and picked up by far the biggest win of his career. The perennial UFC lightweight contender shocked McGregor, beating him via TKO after swarming him with punches at 2:32 of the second round Saturday night in the main event of UFC 257 in Abu Dhabi, United Arab Emirates. Poirier first hurt McGregor on the right leg with kicks to the calf. With McGregor's leg compromised, Poirier ripped off a series of hard-punching combinations. The closing blow was a shovel right hand that dropped McGregor. Poirier followed on the ground, and referee Herb Dean stepped in to call it, marking the first KO or TKO loss of McGregor's 13-year career.