Roger Federer says there are questions that need to be answered about world number one Yannick Sinner avoiding a suspension after failing two doping tests earlier this year.
Sinner tested positive for banned substances twice in March but was cleared of any fault or negligence by the International Tennis Integrity Authority (ITIA).
The independent tribunal accepted Shiner's explanation that Clostebol, an anabolic steroid that can help muscle growth, accidentally entered his body through a product one of his team used to treat a minor wound.
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Jannik Sinner insists he did nothing wrong after testing positive twice for the banned substance clostebol.
The decision was criticised across the tennis world, with some players expressing surprise at the speed with which the case was heard, while others, including Nick Kyrgios, felt Sinner should have been suspended.
Kyrgios described the situation as “ridiculous”, posting to X: “Whether it was accidental or planned. You tested twice for a banned substance (steroids)… you should be clean for 2 years. Your performance has improved.”
Federer believes Sinner did nothing wrong but is surprised the Italian has not been suspended pending the resolution of the incident.
“I think we all believe Jannik didn't do anything,” Federer said on NBC's Today show on Tuesday.
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In an interview with Sky Sports, Jannik Sinner reflected on the investigation into his positive test for banned substances.
“But I think the question that needs to be answered here is the inconsistency that he might not have to sit through while he's not 100 percent sure what's going on.
“But look, here's the truth, and you have to trust everyone involved in this.
“I understand this is a tricky situation. It's a nightmare for every player and team when these claims and issues arise. We fill out these forms every day.
“And it lives with you. Every morning you wake up and you think, 'Is someone going to come to the door and test me?' So it's really hard.
“I understand the frustration of, ‘Was he treated the same as everyone else?’ And I think that’s the crux of it.”
After the ITIA ruling, Cinner said he wanted to put “a challenging and very unfortunate period” behind him.
“I know in my heart that I did nothing wrong, and that helps me a lot in this case,” he told Sky Sports during the US Open.
“Obviously you can't control every outcome of this incident.”
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Jannik Sinner beat Tommy Paul in straight sets at the US Open to advance to the quarterfinals, where he will face Daniil Medvedev.
The 23-year-old has since reached the quarterfinals at Flushing Meadows and will face fifth seed Daniil Medvedev on Wednesday.
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