Sharapova says failed drug test at Australian Open

By Mark Lamport-Stokes LOS ANGELES (Reuters) - 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.