Conor McGregor posted this Floyd Mayweather knockout picture on his Instagram with the caption "I'm a filthy Irish animal." You gotta love the confidence of McGregor going into his first boxing fight with a guy in Mayweather who has never been knocked down much less lost a fight. The 28-year-old Fighting Irishman is a massive Vegas underdog and for good reason: it's a boxing match, not a MMA event. Can McGregor get close enough to Pretty Boy to even land his left hand hook? I'm not sure. Mayweather is the king of not taking a punishing blow. He bobs and weaves like a rabbit being chased by a cheetah. But if anyone can deliver a devastating KO punch it's McGregor.