Maria Sharapova plays a sport.
The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Maria Sharapova . She is also an Olympic medalist , having earned silver for Russia in women 's singles at the 2012 Summer Olympics in London . The WTA Finals ( formerly known as the WTA Tour Championships short : WTA Championships ) , is a professional tennis tournament played annually at the end of the season for the top-ranked players on the Women 's Tennis Association ( WTA ) tour .