Floyd Mayweather Jr., left, and Conor McGregor face off during a weigh-in Friday. The two are scheduled to fight in a much-anticipated bout Saturday.

LAS VEGAS — Floyd Mayweather weighed in at a trim 149 1/2 pounds Friday for his boxing showdown with Conor McGregor, who also made weight at 153 pounds.

The undefeated boxer and the two-division UFC champion weighed in comfortably below the 154-pound limit before a raucous crowd at T-Mobile Arena, which will host the so-called Money Fight on Saturday night.

The enthusiastic crowd included thousands of McGregor’s vocal Irish fans, who sang and waved flags. Mayweather was the villain as usual, but his cheering section also appeared to be more robust than normal for the American antihero.

Mayweather had expressed doubt McGregor could make the weight, but the Irishman roared and flexed as he came in well within the mark. McGregor is making his professional boxing debut in Vegas.

“I’ll stomp my foot in the center of that ring, and I won’t go nowhere,” said McGregor, who expects to weigh around 170 pounds by the first bell.

Mayweather (49-0) came in remarkably light, and he is likely to have a noticeable size disadvantage. Although Mayweather had a bulging six-pack, McGregor claimed he wasn’t impressed.

“He looks blown out and out of shape,” McGregor said. “That’s the worst shape I’ve ever seen him in.”

Mayweather expressed no concern about his own weight disadvantage. The 40-year-old champion’s game is built on speed and elusiveness, not brawn.

“Weight doesn’t win fights,” he said. “Fighting wins fights.”

Mayweather also wasn’t bothered by the crowd booing him.

“I’ve been here before,” Mayweather said. “I know what it takes in a fight of this magnitude. He did a lot of (talking). I did a lot of this. Tomorrow, it comes down to the fighters.”