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.

Wimbledon champion Jannik Sinner has rehired Umberto Ferrara as his fitness coach nearly a year after firing him for his role in the top-ranked player’s doping case.