His first Summer League performance only added to the intrigue surrounding one of the youngest players on the Celtics’ roster. The 6-foot-11 center averaged 2.8 blocks per game during Summer League, the highest mark by a Celtics player in the history of the event. He also performed very well during athletic testing at the 2026 NBA Draft Combine. Celtics Rookie Shares Robert Williams’ Unusual PathThe parallels between Cenac and Williams are difficult to ignore. Cenac already owns a Celtics Summer League record.