Maria Sharapova of Russia hits a return to Alexandra Dulgheru of Romania during the third day of the 2014 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 27 August 2014. The US Open runs through 08 September, a 15-day schedule. EPA/PETER FOLEY

Maria Sharapova of Russia hits a return to Simona Halep of Romania in their quarter-finals match of the Western & Southern Open tennis tournament at the Linder Tennis Center in Mason, Ohio, USA, 15 August 2014. EPA/TANNEN MAURY

Maria Sharapova of Russia returns to Carla Suarez Navarro of Spain during their Rogers Cup third round tennis match in Montreal, Canada, 07 August 2014. EPA/ANDRE PICHETTE

Maria Sharapova of Russia in action during her women’s singles final match against Petra Kvitova of the Czech Republic in the China Open tennis tournament at the National Tennis Center in Beijing, China, 05 October 2014. EPA/HOW HWEE YOUNG

Maria Sharapova of Russia returns the ball to Petra Kvitova of the Czech Republic during their women’s singles final in the China Open tennis tournament at the National Tennis Center in Beijing, China, 05 October 2014. EPA/ROLEX DELA PENA

Maria Sharapova of Russia serves to Alexandra Dulgheru of Romania during the third day of the 2014 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 27 August 2014. The US Open runs through 08 September, a 15-day schedule.