Cooper Flagg’s rumored 2-inch growth sparks NBA Reddit debate

Cooper Flagg’s height fuels NBA Reddit speculation after Instagram like

Cooper Flagg’s listed height of 6-foot-9 may not tell the full story. On 18 June 2026, the Dallas Mavericks rookie liked an Instagram post claiming he grew two inches to 6-foot-11. The unverified report has since sparked a wave of debate across NBA Reddit and X.

What happened?

The spark came when Flagg, 19, engaged with a viral post on Instagram that stated he had grown two inches since last season. The post, which Flagg liked but did not comment on, claimed his new height is 6-foot-11. No official listings or comments from Flagg or the Mavericks have confirmed the change.

Fans on Reddit pointed to Flagg’s perceived height next to teammate Dereck Lively II-a 7-foot center-as evidence he may have grown. Lively, listed at 7-foot, towers over most players, and some commenters argued Flagg now looks closer in size to him than in 2025.

Why it matters for Cooper Flagg

If Flagg is truly 6-foot-11, his wingspan and defensive reach would make him even more dangerous on the perimeter. At 19-turning 20 in late December-he’s still within the age range where players can grow. Most NBA rookies don’t change their listed height after entering the league, but exceptions exist.

Victor Wembanyama, the Spurs’ 7-foot-4 phenom, saw his listed height adjusted after joining the NBA. Kevin Garnett was famously listed shorter than his actual height during his prime. For Flagg, the difference could shift how opponents game-plan against him.

What comes next?

The Mavericks have not issued an updated roster listing with a revised height for Flagg. His official NBA profile still lists him at 6-foot-9. Either Flagg will address the speculation in a media session or the team will release an updated roster before the 2026-27 season.

Until then, the debate rages online. Fans dissect every photo and video, hunting for clues. For Flagg, the real question isn’t his height-it’s how he performs. But if he’s taller, the league should brace for a player who’s already a rising star to become even more unstoppable.