Current men's tennis world No. 1, Jannik Sinner, has tested positive twice for a banned anabolic steroid.
The incident happened in March this year and the Italian tennis player was only stripped of prize money and points earned at a tournament in Indian Wells, California. However, he was not suspended because an independent tribunal said it was not intentional.
The International Tennis Integrity Authority announced the case on Tuesday (August 20).
Sinner just won the championship at the Cincinnati Open on Monday (August 19) and will be one of the brightest candidates at the US Open - the Grand Slam will start in New York next week.
Sinner took the No. 1 spot in the ATP rankings in June and, along with Carlos Alcaraz, is considered the leading stars of the new generation in men's tennis.
Sinner, who turned 23 last Friday, also won the Australian Open in January for the first Grand Slam of his career. He reached the semi-finals of the French Open in June and the quarter-finals of Wimbledon in July, before being unable to attend the Paris Olympics due to health problems.
During the Indian Wells hard court event in March, Sinner tested positive for low concentrations of the metabolite Clostebol, a banned anabolic steroid that may be used for ophthalmic and dermatological purposes.
Sinner tested positive again eight days later in an out-of-tournament sample.
The Italian tennis player was temporarily suspended because of those test results, but he successfully appealed and was allowed to continue playing.
According to ITIA, Sinner explained his test results were due to a support group member using an over-the-counter spray containing Clostebol to treat a minor wound. That team member then gave Sinner a massage.
ITIA said it accepted Sinner's explanation and determined the violation was not intentional.
An independent panel held a hearing on August 15 and "determined that a finding of No Fault or Negligence applied in this case, resulting in no period of ineligibility," according to ITIA.
