Jannik Sinner rehired fitness trainer Umberto Ferrara amid doping controversy and team changes.
Jannik Sinner rehired trainer Umberto Ferrara after doping case; Naldi remains sidelined.
Jannik Sinner's decision to rehire Umberto Ferrara divides tennis community amid doping controversy.
Jannik Sinner rehired fitness coach Umberto Ferrara after winning Wimbledon without a fitness team.
Jannik Sinner rehired coach Umberto Ferrara after reshuffling his team amid doping case fallout.
