Colby Covington: Arman Tsarukyan can knock out Islam Makhachev at UFC 311

Colby Covington isn't ruling out Arman Tsarukyan's chances of taking out Islam Makhachev at UFC 311. Tsarukyan (22-3 MMA, 9-2 UFC) challenges lightweight champion Makhachev (26-1 MMA, 15-1 UFC) in a rematch, which headlines the Jan. 18 event from Intuit…