Roger Federer says there are questions to be answered around world number one Jannik Sinner avoiding a suspension after failing two anti-doping tests earlier this year.
Sinner tested positive for a banned substance twice in March but was absolved of fault or negligence by the International Tennis Integrity Agency.
An independent tribunal accepted Sinner’s explanation that clostebol, an anabolic agent that can aid muscle growth, had accidentally entered his system via a product one of his team had used to treat a small wound.
The decision was met with criticism in the tennis world, with some players surprised at the speed which the case was heard while others, such as Nick Kyrgios, believed Sinner should have been handed a ban.
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