Both the Portland Trail Blazers and Houston Rockets exited a game Friday with injuries to their top-five draft picks, and one of them has already been ruled out for the remainder of NBA Summer League.

Amen Thompson, the No. 4 pick of the 2023 NBA Draft, exited late in the fourth quarter with an ankle injury after falling down during a rebound attempt. While he appeared to land safely, Blazers big man Jabari Walker also fell and landed on Thompson's ankle, appearing to turn it.

ESPN's Marc Spears reported Saturday the injury had been diagnosed as a Grade 2 ankle sprain that would keep Thompson out for three to four weeks, ending his Summer League campaign after one game. Thompson will also reportedly need a walking boot for a week.

It was an encouraging debut for Thompson before the injury, as the wing posted 16 points on 6-of-13 shooting with four rebounds, five assists, three steals and four blocks in 28 minutes.

The other concerning injury was the Blazers' No. 3 pick Scoot Henderson, who was looking strong before exiting in the third quarter with a shoulder issue. At the time, he had 15 points on 5-of-13 shooting with five rebounds and six assists.

One day later, Henderson told reporters his shoulder was improving, but the team was waiting for results before making a decision on when he can play next. TNT's Chris Haynes later reported Henderson will miss at least the team's next game against the San Antonio Spurs on Sunday, which means no clash with top pick Victor Wembanyama.

With both Thompson and Henderson out, it was Rockets wing Jabari Smith Jr., last year's third overall pick, who played the hero with a wild buzzer-beater to give the Rockets a 100-99 win. He finished the game with 33 points, 29 of which were scored in the second half.

That game was the undercard for the more hyped event of Friday, the Summer League debut of Wembanyama with the San Antonio Spurs. The French big man didn't quite meet expectations with nine points on 2-of-13 shooting against the Charlotte Hornets, but he also showed off a defensive prowess and passing ability that helped explain why his ceiling is so high.

Brandon Miller, the No. 2 pick in the draft, had 16 points and 11 rebounds for the Hornets in a 76-68 Spurs win.