When Maria Sharapova announced Monday that she had failed a drug test at the Australian Open by testing positive for the banned drug meldonium, it prompted many questions about what this substance is and how it affects an athlete's performance.
Tennis star Maria Sharapova has lost several major sponsors after admitting that she failed a drug test at the Australian Open. The former world champion has been the highest-paid female athlete in the world for 11 years in a row, Forbes reported last year. She earned US$29.7 million last year — including US$23 million from endorsements and appearances, according to Forbes.