NEW YORK, NY - AUGUST 31: Caroline Wozniacki of Denmark celebrates match point against Maria Sharapova of Russia after winning their women's singles fourth round match on Day Seven of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2014 in the Flushing neighborhood of the Queens borough of New York City.

Maria Sharapova of Russia returns a shot against Caroline Wozniacki of Denmark during their 2014 US Open women's singles match at the USTA Billie Jean King National Tennis Center August 31, 2014 in New York.

NEW YORK, NY - AUGUST 25: Maria Kirilenko of Russia returns a shot against Maria Sharapova of Russia during her women's singles first round match on Day One of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 25, 2014 in the Flushing neighborhood of the Queens borough of New York City.

Russia's Maria Sharapova poses with the Suzanne Lenglen trophy in Paris on June 8, 2014 a day after winning the Roland Garros French Tennis Open.

PARIS, FRANCE - JUNE 7: Maria Sharapova of Russia celebrates her victory with her team, coach Sven Groeneveld, hitting coach Dieter Kindlmann and physiotherapist Jerome Bianchi, following her victory in the women's singles final match against Simona Halep of Romania on day fourteen of the French Open at Roland Garros on June 7, 2014 in Paris, France.