Jannik Sinner’s decision to reappoint Umberto Ferrara as his fitness coach raises major questions about judgment and principles. It gives conflicting messages about responsibility and trust when the world’s No.

Wimbledon champion Jannik Sinner has confirmed he has reappointed his former fitness coach Umberto Ferrara with immediate effect. Italian world No.1 Sinner parted ways with Ferrara and physiotherapist Giacomo Naldi last year after the investigation into his positive tests for the banned substance clostebol in March.

World number one Jannik Sinner reappoints fitness coach Umberto Ferrara less than a year after they parted company.