Who is the best tennis player of all time?

6. Serena Williams

Toby Melville/Reuters
Serena Williams of the hits a return to Russia's Maria Sharapova at the 2010 Wimbledon tennis championships in London, June 28.

Serena, one-half of the dynamic Williams sisters on the women's pro tour, has seen her star rise in the last ten years. She has 17 Grand Slam singles championships, 13 Grand Slam doubles, 2 mixed doubles, and a career Grand Slam.

[Editor's note: Serena's total of Grand Slam singles titles has been updated since this first appeared to reflect 2013 results.]

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