LAS VEGAS — Zion Williamson’s first NBA show was a sellout.

And it ended earlier than the fans wanted.

The No. 1 overall draft pick by the New Orleans Pelicans didn’t keep his adoring new public waiting for his display of dunks and power. With tickets commanding more than $500 on the resale markets throughout the day from those desperate to be part of the crowd — one that included LeBron James and Floyd Mayweather — Williamson took the floor as a pro for the first time Friday night at the NBA Summer League, scoring 11 points in nine first-half minutes against the New York Knicks and fellow former Duke star RJ Barrett.

But Williamson didn’t play in the second half because of a knee-to-knee hit, and fans who were chanting “We want Zion! We want Zion!” weren’t going to get any more than those first nine minutes.

So the event — maybe the hottest ticket in Vegas on a night when Reba McEntire and Brooks and Dunn were doing their thing at Caesars Palace, Gwen Stefani was at Planet Hollywood and Wiz Khalifa was playing a late show at a nightclub — ended earlier than anyone anticipated.

“Obviously, the guy we drafted put a buzz in the air for everybody in here,” Pelicans coach Alvin Gentry said.

That he did.

It would be inaccurate to say the whole NBA was watching. It only seemed that way.

James was in a baseline seat, a few spots to the right of San Antonio’s DeMar DeRozan. Mayweather arrived a few minutes before game time. Trae Young of the Atlanta Hawks was there and so was Lonzo Ball — James’ teammate with the Lakers, until the trade that sends him to New Orleans as part of the Anthony Davis swap happens on Saturday. Davis arrived in the middle of the first quarter.