epa05200061 Russian tennis player Maria Sharapova leaves after a press conference at the LA Downtown Hotel in Los Angeles, California, USA, 07 March 2016. Maria Sharapova revealed that she failed a drug test being tested positive for Meldonium at the Australian Open at a press conference in Los Angeles, USA, on 07 March 2016. The anti-ischemic drug 'Meldonium' has been added to the latest list of forbidden susbtances issued by the World Anti Doping Agency (WADA), which has added caffeine and nicotine to substances it is monitoring. EPA/MIKE NELSON

epaselect epa05200026 Russian tennis player Maria Sharapova at a press conference where she announced that she failed a drug test after being tested positive for Meldonium at the Australian Open at a press conference at the LA Downtown Hotel in Los Angeles, California, USA, 07 March 2016. The anti-ischemic drug 'Meldonium' has been added to the latest list of forbidden susbtances issued by the World Anti Doping Agency (WADA), which has added caffeine and nicotine to substances it is monitoring. EPA/MIKE NELSON

epaselect epa05200020 Russian tennis player Maria Sharapova (L) at a press conference where she announced that she failed a drug test after being tested positive for Meldonium at the Australian Open at a press conference at the LA Downtown Hotel in Los Angeles, California, USA, 07 March 2016. The anti-ischemic drug 'Meldonium' has been added to the latest list of forbidden susbtances issued by the World Anti Doping Agency (WADA), which has added caffeine and nicotine to substances it is monitoring. EPA/MIKE NELSON