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.

Nick Kyrgios has hit out at Wimbledon champion Jannik Sinner over his decision to re-appoint the fitness coach he split with after last year’s positive tests for banned substance clostebol.

World No. 1 Jannik Sinner rehired Umberto Ferrara as his fitness coach just under a year after firing him for his role in his doping case.