Both the International Tennis Federation and the Women's Tennis Association say they warned players, including Sharapova, five times that meldonium was to be bannedPhoto: FameFlynet'Honest mistake': Sharapova, 28, announced on Monday that she had been caught in a doping test after taking the drug, which became a banned substance in January

Maria Sharapova was 'warned five times' by tennis authorities meldonium had been banned in January - Russian federation warned her too
   
    Sharapova said she'd taken meldonium for ten years for 'health issues'but acknowledges 
'it is every player's responsibility to know what they put in their body and to know if it is permissible.'

Maria Sharapova 28, announced on Monday that she had been caught in a doping test after taking the drug, which became a banned substance in January.  She failed a doping test at the Australian Open

'Honest mistake': Sharapova, 28, announced on Monday that she had been caught in a doping test after taking the drug, which became a banned substance in January
Photo: Getty Images