Sergey Kovalev has reportedly tested positive for Synthetic Testosterone Photo Credit: Tom Hogan-Hoganphotos/Golden Boy Sergey Kovalev’s clash with Bektemir Melikuziev is in doubt after the former Light Heavyweight world champion reportedly tested positive for Synthetic Testosterone, as first reported by Dan Rafael of BoxingScene.com. Kovalev, 37, was due to face the unbeaten Uzbekh talent, Melikuziev in a catchweight 178lbs showdown on January 30, live on DAZN, in his first fight in over 14 months, since losing his WBO Light Heavyweight crown to Canelo Alvarez in Las Vegas last November. According to BoxingScene, the positive result was returned on Wednesday by Voluntary Anti-Doping Association (VADA), following a sample given by the Russian on December 30.