Jannik Sinner, the world No.1 and defending Wimbledon champion, served a three-month doping suspension from February 9, 2025, to May 4, 2025, after testing positive for the banned steroid clostebol. The ban followed a settlement between Sinner and the World Anti-Doping Agency (WADA), which accepted his explanation that the contamination was accidental but held him responsible for his team's negligence.
How Did the Contamination Happen?
Sinner twice tested positive for clostebol in March 2024. Clostebol is an anabolic steroid that can be used to build muscle mass. WADA accepted Sinner's account that the substance entered his system through a massage from his physiotherapist, who had used a spray containing clostebol to treat a cut on his own finger. The agency ruled that Sinner 'did not intend to cheat' but emphasized that he bore responsibility for his support team's actions.
Initial Ruling and Controversy
In August 2024, an independent tribunal initially cleared Sinner of any fault or negligence, ruling that no period of ineligibility would apply. Instead, the tribunal ordered Sinner to forfeit prize money and ranking points earned at the Indian Wells tournament in March 2024. This decision sparked controversy among fellow tennis players, many of whom alleged favoritism due to Sinner's high profile and access to top legal representation. WADA appealed the decision, leading to the eventual settlement and three-month ban.
Timeline of Sinner's Suspension and Return
Sinner's last tournament before the ban was the Australian Open in January 2025, which he won for his third Grand Slam title. He then served his suspension from February to May 2025, returning at the Italian Open in May. He also played at the French Open (Roland-Garros) shortly after, finishing as runner-up to Carlos Alcaraz both times. The timing of the suspension allowed Sinner to compete at Roland-Garros, which drew criticism.
Criticism from Tim Henman
Former British No.1 Tim Henman expressed discontent with the settlement. 'It just seems a little bit too convenient,' Henman said. 'Having just won the [2025] Australian Open, to miss three months of the Tour and therefore to be eligible to play at Roland-Garros, the timing couldn’t have been any better for Sinner, but I still think it leaves a pretty sour taste for the sport. When you’re dealing with drugs in sport it very much has to be black and white, it’s binary, it’s positive or negative, you’re banned or you’re not banned. When you start reading words like settlement or agreement, it feels like there’s been a negotiation and I don’t think that will sit well with the player cohort and the fans of the sport.'
Impact on Sinner's Career
Despite the controversy, Sinner heads into Wimbledon 2026 as the defending champion and a strong favorite to win his fifth Grand Slam title. He beat rival Carlos Alcaraz in the 2025 Wimbledon final. The doping saga has not derailed his career, but it continues to fuel debate about fairness and consistency in anti-doping enforcement.
