Sponsored Content SportsEngine, a brand from NBC Sports Next is the leading provider of Sport Relationship Management (SRM) software, empowering athletes, parents, coaches, and sports organization administrators with tools and services to manage their organizations and sports lives. Read SportsEngine stories Floyd Mayweather Jr. vs. Conor McGregor May 22, 2021 | 0 minutes, 25 seconds read On this day, in 2017 Mayweather extended his pro boxing undefeated streak to 50 victories , surpassing Rocky Marciano, after defeating McGregor by a 10th round TKO. August 26, 2017 Sport: Boxing Trivia sports in this article Boxing tags in this article Fan On This Day SportsEngine