Tennisqueen Serena Williams

EPAepa03392594 Serena Williams of the USA poses with the US Open womens singles championship trophy the day after defeating Victoria Azarenka of Belarus in the womens final match of the 2012 US Open Tennis Championship in Central Park in New York, USA, 10

USO27D:SPORT-TENNIS:NEW YORK,11SEP99 - Serena Williams of the United States hits to Martina Hingis of Switzerland during the U.S. Open final in Flushing Meadows September 11. Williams is the number seven seed in the tournament. pj/Photo by Jeff Christense

Serena Williams of the USA poses with the winners cup at the end of her French open tennis championships final match against her sister Venus at the Roland Garros stadium, June 8, 2002. Serena beat Venus 7-5 6-3. REUTERS/Jack Dabaghian

Serena Williams of the United States celebrates a point in her win at the Australian Open in Melbourne January 25, 2003. Serena defeated her sister Venus Williams 7-6 3-6 6-4. REUTERS/Stuart Milligan

US player Serena Williams (L) and sister Venus are all smiling during the trophy ceremony for the Womens Final at the All England Lawn Tennis Championships in Wimbledon, Saturday 05 July 2003. Serena Williams defeated her sister Venus in three sets 4-6, 6

EPAepa01478950 Serena Williams of the US hits a backhand return to Dinara Safina of Russia during the second womens semifinal match on the eleventh day of the 2008 US Open tennis tournament in Flushing Meadows, New York, USA on 05 September 2008. The winn

dapdSerena Williams of the US reacts during the match against Frances Aravane Rezai at the All England Lawn Tennis Championships at Wimbledon, Tuesday, June 21, 2011. (Foto:Sang Tan/AP/dapd)

EPAepa03299415 Serena Williams of the US returns to Agnieszka Radwanska of Poland during the womens final match for the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 07 July 2012. EPA/GERRY PENNY

EPAepa03391951 Serena Williams of the US celebrates with the trophy after defeating Victoria Azarenka of Belarus in the womens final match on the fourteenth day of the 2012 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows

REUTERSSerena Williams of the U.S. poses with her trophy after defeating Victoria Azarenka of Belarus in their womens singles finals match at the U.S. Open tennis tournament in New York September 9, 2012. REUTERS/Kevin Lamarque (UNITED STATES - T