In March 2016 , Sharapova revealed she had failed a drug test at the 2016 Australian Open on January 26 , 2016 , admitting to testing positive for meldonium , a substance banned by the World Anti-Doping Agency ( WADA ) .
In March 2016 , Sharapova revealed she had failed a drug test at the 2016 Australian Open on January 26 , 2016 . 
 She had tested positive for meldonium , a substance that had been banned , effective January 1 , by the World Anti-Doping Agency ( WADA ) .