World No. 1 Jannik Sinner has handled recent doping allegations with grace and maturity, choosing not to respond aggressively to Australian player Nick Kyrgios' critical comments. Despite the controversy, Sinner has advanced smoothly in the US Open, defeating American Alex Michelsen. The Italian was cleared of any fault or negligence by an independent tribunal, which accepted that the banned substance entered his system accidentally through a massage spray. Sinner has since fired his physio and trainer, remaining focused on his matches.