Floyd Mayweather Jr. delivered a technical knockout victory over U.F.C. champion and first-time boxer Conor McGregor on Saturday night at Las Vegas.

In the 10th round of a surprisingly well-matched fight, Mayweather backed McGregor onto the ropes with a series of rights and lefts.

McGregor’s face was completely bloodied. He was about to fall through the ropes, and the referee stepped in to stop the fight with 1:55 remaining in the round.

The victory improved Mayweather’s record to 50-0, and allowed the typically defensive fighter to say farewell in thrilling fashion in what he said was his last fight.

It also proved right the naysayers who said that this fight was nothing more than a glorified, money-making exhibition.

He landed a few touch punches but nothing solid the entire fight. And given that U.F.C. fights are much shorter than boxing matches, McGregor’s stamina was in question. And he certainly seemed to tire in the late rounds as Mayweather made easy work of him.

Although McGregor is one of the biggest stars in mixed martial arts, he had not boxed since he was a teenager, and had no professional boxing matches under his belt.