The trash-talking Irishman sent thousands of his countrymen home deliriously happy by scoring an improbable knockout victory over Chad Mendes after enduring a ton of abuse Saturday at the MGM Grand in their bout for the interim featherweight title in the main event of UFC 189. Mendes was a late replacement for champion Jose Aldo, who pulled out of the bout with a rib injury. Mendes is a wrestler, a totally different style of fighter than Aldo, and gave McGregor fits.