Fresh off an appearance in the NBA Finals in only his third season in the league, San Antonio Spurs wunderkind center Victor Wembanyama was poised to cash in this summer. On Friday, he did—to an extent. Wembanyama agreed to a five-year maximum-contract extension with the Spurs, according to ESPN’s Shams Charania, which is projected to be worth north of $250 million. However, his contract will star...