BERLIN: World super middleweight champion Felix Sturm announced on Saturday he had tested positive for an anabolic steroid following his win over Russia’s Fedor Chudinov last February. The 37-year-old German was found to have the steroid Hydro-XY Stanozolol in his A sample following his majority decision rematch win over Chudinov in Oberhausen on February 20 for the WBA belt.