Mavericks general manager Nico Harrison is making significant changes to the team’s health and performance group, according to a person with knowledge of the moves. Among them, head athletic trainer Dionne Calhoun and athletic performance director Keith Belton have been relieved of their roles.

Nico Harrison just cannot get out of his own way. The general manager of the Dallas Mavericks has had a rough 2025, mostly his own fault, which started when he traded away Luka Doncic, a beloved figure within Dallas,

Dallas Mavericks general manager Nico Harrison has been crucified by the team's fans for trading away generational superstar Luka Doncic. Even worse, the Mavs seemed to only head downward after the trade.