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American Frances Tiafo defeated Rafael Nadal in the fourth round.

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The Maryland native overcame Nadal 6-4, 4-6, 6-4, 6-3 in a showdown that lasted more than three hours and thirty minutes.

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Tiafo, 24, is the youngest American player at the US Open, having reached the Roddick final in 2006.

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It was unquestionably a terrific performance, he commented after the game.

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Tiafoe declared he was content to be largely unnoticed during the competition.

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Tiafo said I believed I could do it. This helps me play him twice.

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Tiafoe, according to Nadal, played more steadily than in their previous meetings, served well, had nice backhands, and was speedy.

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