Jannik Sinner advances at US Open against backdrop of doping case - ESPN

NEW YORK — If there were any boos directed Jannik Sinner's way at the US Open, they were imperceptible amid the polite applause from the sparse crowd at Arthur Ashe Stadium when he was introduced Tuesday before the No. 1-ranked man's first match since his doping case emerged a week ago.

After a sloppy and slow opening set, Sinner pulled away for a 2-6, 6-2, 6-1, 6-2 victory against Mackenzie McDonald of the United States to reach the second round at Flushing Meadows.

There were no apparent signs in the stands or disparaging shouts making reference to what no one knew about for months: Sinner tested positive twice for trace amounts of the anabolic steroid clostebol in an eight-day span in March.

Nothing was announced publicly until last week, when word came that the 23-year-old Italian was docked prize money and ranking points from the tournament where the first result appeared, but he escaped a suspension because it was ruled he was not at fault and the drug entered his system unintentionally, through a massage from his physiotherapist.

In his first public comments on the matter, at a pre-tournament news conference Friday, Sinner said he had fired the fitness trainer who bought an over-the-counter spray containing clostebol in Italy and the physiotherapist who used it for a cut on his finger before treating the player and transferring the substance to his body.

During a brief on-court interview in Ashe, Sinner wasn't asked about the case, which has drawn some criticism from other players, including Novak Djokovic, about the way it was handled and questions about whether certain athletes are treated differently than others when it comes to the process for determining punishments related to doping.

But in an indication of