Anthony Joshua delivered a knockout in the seventh round to defeat Alexander Povetkin at Wembley Stadium on Saturday, retaining his WBA, IBF, WBO and IBO world heavyweight championship belts.
Meldonium burst to the fore in 2016 when Maria Sharapova announced that she had failed a drugs test. Although she was banned for 15 months, more than 170 athletes have since tested positive for the substance, Olympians included.
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