US Open’s top seed Jannik Sinner explains how banned anabolic steroid Clostebol entered his system

Jannik Sinner, the Italian tennis star, fired his fitness trainer and physiotherapist after testing positive for steroids in March. Sinner explained that the banned substance Clostebol entered his system unintentionally through a massage. Cleared of any wrongdoing, Sinner remains focused on his upcoming match at the U.S. Open. His record remains impressive this season.