A five-time major champion made the announcement at a news conference yesterday in Los Angeles.

Sharapova said she tested positive for meldonium, which she has been taking for 10 years for health issues. Meldonium became a banned substance this year.

The WTA has not announced a penalty. Sharapova, currently sidelined with a forearm injury, hasn't competed since losing to Serena Williams in the quarterfinals of the Australian Open in January.

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