Conor McGregor, the brash U.F.C. champion, takes on undefeated boxer Floyd Mayweather Jr. in the most anticipated boxing match in years. The undercard is underway, but the main event is expected to begin much later. Stay here for live, round-by-round updates and analysis. How to watch.
In the first of three featured undercard bouts, youth triumphed over experience.Andrew Tabiti, 27, defeated a former world champ, Steve Cunningham, still lacing them up at 41. Tabiti held on to his USBA/NABF title by unanimous decision.