Despite testing positive for a prohibited drug in March, the Italian player was allowed to resume his career. He has consistently insisted to being innocent.
The positive test results were caused by a spray of trofodermin, which was purchased by Sinner’s physical trainer and includes the illegal anabolic steroid clostebol.
The International Tennis Integrity Agency (ITIA) cleared the world number one of any wrongdoing or negligence, however, and an impartial tribunal accepted his claim that clostebol had “accidentally entered his system via a product one of his team had used to treat a small wound.”
However, a number of players, both past and present, have questioned why Sinner was not punished while the situation was looked into.
“I think we all trust pretty much that Jannik didn’t do anything,” tennis legend Roger Federer said on NBC’s Today show.
“However, the discrepancy might have meant he didn’t have to watch while they weren’t entirely sure what was happening. That, in my opinion, is the question that has to be addressed here.
“But see, things are as they are. We must have faith in both the procedure and all those engaged in this.”
