Maria Sharapova said Monday that she had been notified by the International Tennis Federation that she tested positive for a banned substance at the Australian Open in January.
She said she had been taking Mildronate since 2006. Mildronate is also known as Meldonium, which was added to the prohibited list this year.
Sharapova said she received an email from the World Anti-Doping Agency in December that noted changes to tennis’s program for 2016. She said that the email including a link to a list of banned substances, but that she did not look at it.