Maria Yuryevna Sharapova is a Russian professional tennis player of Belarusian descent. A United States resident since 1994, Sharapova has competed on the WTA tour since 2001. She has been ranked world No. 1 in singles by the WTA on five separate occasions, for a total of 21 weeks. She is one of ten women, and the only Russian, to hold the career Grand Slam. She is also an Olympic medalist, having won silver in women's singles at the 2012 Summer Olympics in London.Sharapova became the world No. 1 for the first time on August 22, 2005, at the age of 18, and last held the ranking for the fifth time for four weeks from June 11, 2012, to July 8, 2012.