Maria Sharapova withdrew from the London Olympics due to a knee injury . Russian star sustained the injury in three - set win at Rogers Cup Wednesday . `` The timing is so unfortunate and this makes me more sad than anything . '' Sharapova now a serious doubt for the final grand slam at Holly courts .
Maria Sharapova withdrew from the London Olympics due to a knee injury . Russian star sustained the injury in three - set win at Rogers Cup Wednesday . Sharapova now a serious doubt for the final grand slam at Holly courts .