Sinner Stops Working With Fitness Trainer And Physiotherapist After Doping Saga
Jannik Sinner Parts Ways with Fitness Trainer and Physiotherapist Amid Doping Controversy Jannik Sinner has officially severed ties with his fitness trainer Giacomo Naldi and physiotherapist Umberto Ferrara following their involvement in the Italian tennis star’s two positive tests for a banned substance. As Sinner gears up for the US Open, he is striving to…