.World No. 1 Jannik Sinner steers clear of revocation after testing positive for prohibited element Yahoo SportsTennis world No 1 Jannik Sinner will not be actually hung down after checking positive for steroid twice, ITIA says Fox NewsATP statement on Jannik Criminal ATP TourWorld No. 1 Jannik Sinner Won't Skin Revocation After Falling Short 2 Tests for PEDs Bleacher Report.