How Frances Tiafoe went from sleeping in a tennis center to reaching the semi-finals of the US Open

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After stunning 22-time Grand Slam champion Rafael Nadal to reach

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the US Open quarter-finals on Monday, Francis Tiafoe dropped his

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racket to the floor and covered his face in surprise.

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It felt like a turning point in the 24-year-old American's career;

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the culmination of hard work and talent that has long been heralded as

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the potential future of men's tennis in the country.