Flagg had an incredible showing against the San Antonio Spurs, but there's one thing he knows he needs to fix.

Dylan Harper and Cooper Flagg — showed out Saturday in NBA Summer League action, with Harper’s San Antonio Spurs beating Flagg and the Dallas Mavericks 76-69.

Cooper Flagg led the Mavericks with a game-high 31 points, four rebounds and one assist, while David Jones-Garcia scored 18 points off the bench for the Spurs. Here are five observations from Saturday’s game:

Cooper Flagg's first NBA Summer League game in Las Vegas did not go perfectly as planned. He shot 5-for-21, scoring only 10 points, but made an impact in a vari

LAS VEGAS- In a battle that featured three 2025 lottery picks, the anticipation didn’t outweigh the on-court production.

Flagg scored 31 points in 31 minutes in Saturday's showdown with No. 2 overall pick Dylan Harper, as the Mavericks fell to the San Antonio Spurs, 76-69. His 31 points were the most by a No. 1 pick in the Las Vegas Summer League since John Wall in 2010,

Dallas Mavericks rookie Cooper Flagg will enter his rookie season with an NBA 2K26 rating of 82. Flagg shared his rating in a video posted Saturday on social media by Ronnie Singh. "I'm very happy with that. Been playing 2K for a while, so I think that's a very generous rating," Flagg said in the video.

All in all, the showdown between the No. 1 pick and No. 2 pick Dylan Harper was as good as it was expected to be, even if it wasn’t advertised on the same level as Flagg’s debut against the Los Angeles Lakers — and Bronny James.