World tennis superstar Maria Sharapova has failed a drug test.

The former world No.1 has revealed she tested positive for Meldonium at this year’s Australian Open.

The substance was banned from January 1.

It’s said to increase the endurance performance of athletes and improve their rehabilitation capacity.

The Russian tennis ace said she’d been taking the drug since 2006.

The five-time Grand Slam champion, 28, says she takes full responsibility for what happened and says she doesn’t want this to end her career.

Leading sports doctor Peter Brukner, who works with the Australian cricket team, told Ross and John he expected Sharapova to be banned.

‘I think she’ll be rubbed out ? she more or less has to be ? and probably for two years, I would have thought,’ Brukner said on 3AW Breakfast.

‘In the last 18 months or so there were rumours it was being used as a performance enhancing drug (and) when WADA hears that, they’re duty bound to investigate and they started specifically testing for this drug.

‘Most of these drugs get out of your system within two or three days.’

Click PLAY below to hear Dr Peter Brukner explain more on 3AW Breakfast