Famous American boxer Floyd Mayweather commented on Conor McGregor's Instagram post, where he announced his departure from MMA. Note that in 2017, the former UFC champion in two weight categories spent with Mayweather boxing match and lost by technical knockout. Earlier, he told Mike Tyson that in the event of a rematch, the American would be defeated. “If I don’t confuse anything, you told Mike Tyson that you would beat me in the second match, and now you are ending your career. I thought you want to defeat the best in history. Well, if you want to do this, I will be ready and will punish you again, "Mayweather said.