Filed under: News , UFC , Videos Conor McGregor ’s victory over Chad Mendes at UFC 189 to win the UFC interim featherweight championship was the toughest fight of his UFC career and was still a second round TKO victory . Making the victory even more impressive is McGregor’s (18-2 MMA, 6-0 UFC) claim during a recent fan Q&A in Dublin that his knee injury was more significant than he had previously let on. “Fourteen weeks before the fight I tore 80 percent of my ACL,” McGregor said. “I could barely walk. I could barely kick.” McGregor said that it was through the quality of his training partners and awareness of his own body that he was able to overcome Mendes (17-3 MMA, 8-3 UFC), the No. 5 ranked fighter in the NOS Energy Drink MMA featherweight rankings .