Nick Kyrgios hit out after Jannik Sinner escaped a tennis ban despite the world number one failing two drugs tests.
Sinner tested positive for the banned anabolic steroid Clostebol in his urine during the Indian Wells tournament in March.
A tribunal accepted that the two failed tests were caused due to contamination through a massage from his physiotherapist.
His lawyers said it amounted to ‘less than a billionth of a gram’.
It was claimed that Sinner was contaminated by a healing spray used to treat a cut suffered by his physio, Giacomo Naldi.
The International Tennis Integrity Agency (ITIA) confirmed on Tuesday that Sinner bears “no fault or negligence”.
“I will now put this challenging and deeply unfortunate period behind me,” Sinner said.
“I will continue to do everything I can to ensure I continue to comply with the ITIA’s anti-doping programme and I have a team around me that are meticulous in their own compliance.”
Meanwhile a statement from Sinner’s representatives read: “Jannik has cooperated fully with the ITIA’s investigation from the beginning.
“The ITIA is battling misconduct in sport and doping in particular.
“Its rules and processes are exceptionally rigorous and following forensic investigation and an independent hearing, the independent tribunal have decided that Jannik is innocent. He is not at fault.”
Sinner is free to continue playing tournaments, including next week’s US Open, but has been docked 400 ranking points and the £250,000 in prize money for reaching the semi-finals at Indian Wells.
A statement from the ATP said: “We are encouraged that no fault or negligence has been found on Jannik Sinner’s part.
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“We would also like to acknowledge the robustness of the investigation process and independent evaluation of the facts under the Tennis Anti-Doping Programme (TADP), which has allowed him to continue competing.
“This has been a challenging matter for Jannik and his team, and underscores the need for players and their entourages to take utmost care in the use of products or treatments. Integrity is paramount in our sport.”
The announcement came less than 24 hours after Sinner had won the Cincinnati Open, his fifth tour title of the year.
He was due to travel to New York on Tuesday to start his preparations for the US Open.
Writing on X, Kyrgios wrote: “Ridiculous – whether it was accidental or planned. You get tested twice with a banned (steroid) substance… you should be gone for 2 years.
“Your performance was enhanced. Massage cream…. Yeah nice.”