(CNBC) — Former tennis world number one Maria Sharapova said on Monday that she failed a drug test at the Australian Open due to a substance she has been taking the last 10 years for health issues.
The 28-year-old Russian, a five-times grand slam champion, tested positive for meldonium, which is used to treat diabetes and low magnesium, and was only banned by the World Anti-Doping Agency as of Jan. 1.
"I made a huge mistake. I let my fans down and I let the sport down. I have been playing since the age of four a sport that I love so deeply," Sharapova told a news conference in Los Angeles.
Advertisement - story continues below