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How John Isner Became One of the Best Tennis Players in the World?

John Isner poster

John Isner is an American tennis player, who is currently ranked as #10 in the world with the best career ranking of #8 in July 2018. John is one of the best servers of the ATP World Tour. Also, he and Nicolas Mahut are the record holders of the longest professional tennis match in history, […]

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