Former light heavyweight world champion Sergey Kovalev has failed the latest drug test, which is likely to put the Russian boxer’s upcoming clash against Bektemir Melikuziev in jeopardy. Traces of synthetic testosterone found in Sergey Kovalev’s voluntary test sample Sergey Kovalev (34-4-1, 29 KOs), who has held the WBA (Super), IBF and WBO titles in the past, had … Continue reading Sergey Kovalev fails dope test, Bektemir Melikuziev fight uncertain