CER addresses doping allegations after evading suspension world number one in men's tennis Yen sinner addressed numerous questions during Friday's US Open media availability regarding his avoidance of a doping suspension despite testing positive for a prohibited substance on two occasions in March sinner insists he hasn't done anything wrong the international tennis Integrity agency Isa disclosed on Tuesday that Center tested positive for colable in anabolic steroid at low levels from a sample taken on March 10th during the Indian Wells tournament a subsequent sample collected 8 days later also returned a lowlevel positive result however the ISA determined that the Italian Star