When rumors first started that Conor McGregor was in talks to fight boxer Floyd Mayweather, no one really believed it would happen.
Mayweather had already retired with an undefeated 49-0 record. But more importantly, McGregor was under UFC contract, and not since Chuck Liddell traveled to Japan to take part in the PRIDE Middleweight Grand Prix in 2003 had the organization shared an athlete with another promotion.
McGregor willed that fight into existence, and he did much better over 10 rounds with Mayweather than most expected. But in the end, he lost by TKO and returned to the sport of MMA.