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. The pomp and circumstance usually means that these fights start pretty late. Expect it to start around midnight on the East Coast. Stay here for live, round-by-round updates and analysis. How to watch.
After a series of decisions, fans finally got a knockout on the undercard.