Jannik Sinner doping case: Why men's tennis world No 1 is at risk of a ban after WADA appeal

Following an appeal against Jannik Sinner being cleared of responsibility for testing positive for a banned substance, Sky Sports News' Geraint Hughes analyses the situation facing men's tennis world No 1. How did Sinner test positive for a banned substance?Sinner tested positive twice in March this year for a banned anabolic steroid called Clostebol which is derived from testosterone. In line with anti-doping processes throughout professional sport, Sinner provided a sample to anti-doping controllers. He first did so on March 10 during a tournament at Indian Wells. Eight days later in an out-of-competition test prior to the Miami Open the Italian also returned a positive test. Both Sinner's tests amounted to less than a billionth of a gram, in essence trace amounts. Stream live tennis on Sky Sports and more with NOWWATCH: Relive the best moments from 2024 US OpenSinner was informed of the positive test results and was initially provisionally suspended from tennis on April 4. He succes...