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American Frances Tiafoe upsets No. 2 seed Rafael Nadal with win in fourth round of U.S. Open

24-year-old Frances Tiafoe put on the performance of his career on Monday at the U.S. Open, with a 6-4, 4-6, 6-4, 6-3 upset win over 22-time Grand Slam champion Rafael Nadal in the fourth round. Tiafoe, who has just one ATP title on his résumé, advances to the quarterfinals of a major for just the second time in his career and first since