Who is the greatest American tennis player ever?

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Now that arguably the best Grand Slam tennis event of the year is underway at Wimbledon, tennis fever is captavating the world. But who is the greatest American tennis player ever? Over the years Wimbledon has seen some great American tennis champions from John McInroe to Pete Sampras, Venus and Serena Williams to Billie Jean King. But was the greatest of them all in your opinion?