Cooper Flagg’s rookie ride slammed to a halt yesterday in Dallas, when the Mavericks’ No. 1 pick limped out of the regular-season finale against the Chicago Bulls with a left ankle injury. The 19-year-old exited in the second quarter and was quickly ruled out, cutting short a late scoring surge that had vaulted him back into the Rookie of the Year conversation.
How the injury unfolded
Flagg landed on a Chicago player’s foot and rolled his left ankle awkwardly, then hobbled straight to the locker room and never returned. Before the injury he had already piled up 10 points, four rebounds and one assist in just nine minutes, extending the string of late-season scoring bursts that had become his calling card, as reported by The Dallas Morning News.
Immediate details and season numbers
ESPN’s game recap notes that Flagg twisted his ankle while trying to tip in his own miss between two Bulls defenders. The Mavericks immediately took a foul with 10:11 left before halftime to get him off the floor, then ruled him out a few minutes later.
According to ESPN’s player page, Flagg’s 2025–26 line settles at roughly 21 points, 6.7 rebounds and 4.6 assists per game, production that made the teenager a central piece of Dallas’ offense from the jump.
Late surge and Rookie of the Year stakes
Flagg closed the year on a heater, dropping 33, 45 and then a 51-point eruption in three April outings that shoved his Rookie of the Year case back into the spotlight. The race is still tight, with Flagg and his former Duke teammate Kon Knueppel widely discussed as the top two candidates, according to CHRON. How voters balance his late push against total availability will be a talking point well into awards season.
What comes next
The Mavericks will wait on imaging and full medical evaluations before putting a recovery timeline on the injury, and the franchise’s offseason plans now tilt even more toward keeping their 19-year-old cornerstone healthy. For Dallas, Flagg’s rookie campaign will be remembered for those explosive scoring nights and the sudden, painful way it ended.
