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

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.