<Tr> <Th_colspan="2"> Result </Th> </Tr> <Tr> <Td_colspan="2"> Mayweather defeats McGregor in 10th round by TKO </Td> </Tr> <P> Floyd Mayweather Jr. vs. Conor McGregor, also known as "The Money Fight" and "The Biggest Fight in Combat Sports History", was a professional boxing match between undefeated eleven - time five - division boxing world champion Floyd Mayweather Jr. and two - division mixed martial arts (MMA) world champion and at - the - time current UFC Lightweight Champion Conor McGregor . The match took place at the T - Mobile Arena in Paradise, Nevada, on August 26, 2017 at the light - middleweight weight class (154 lbs; 69.9 kgs). It was scheduled for twelve rounds . </P> <P> Mayweather extended his professional boxing undefeated streak to 50 victories and 0 defeats (50--0), surpassing the 49--0 record of Hall of Famer Rocky Marciano by defeating McGregor by technical knockout (TKO) in the 10th round . Mayweather's guaranteed disclosed paycheck was $100,000,000 and McGregor's guaranteed disclosed paycheck was $30,000,000 . However, the purse for the two fighters was expected to be substantially higher for each, with Mayweather reportedly earning over $300,000,000 from the fight and McGregor earning $100,000,000 . </P>

What weight class is mayweather and mcgregor fighting at