Despite UFC star Conor McGregor's never-ending string of guarantees he would knock out the undefeated legend in his first-ever professional boxing match, Mayweather predictably maintained his perfect record after scoring a 10th-round TKO in the massively hyped non-title, junior middleweight bout, in front of 14,623 fans at T-Mobile Arena.

Returning to the ring for the first time in nearly two years, Mayweather (50-0, 27 KOs) surpassed Rocky Marciano's revered 49-0 mark, and reportedly earned more than $200 million to fight the brash, and inexperienced, Irishman, who also collected a nine-figure payday, in an event expected to set revenue and viewership records.

Mayweather had won his previous seven bouts by decision, and hadn't scored a knockout since beating Victor Ortiz in 2011.