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Lucas Pouille of France (L) and Rafael Nadal of Spain switch sides during the tie break of their US Open Men's Singles match at the USTA Billie Jean King National Tennis Center in New York on September 4, 2016. Fourteen-time Grand Slam champion Rafael Nadal was sent crashing out of the US Open on Sunday, falling in a five-set thriller to 22-year-old Frenchman Lucas Pouille. Pouille, ranked 25th in the world, reached the quarter-finals with a 6-1, 2-6, 6-4, 3-6, 7-6 (8/6) triumph. / AFP / EDUARDO MUNOZ ALVAREZ (Photo credit should read EDUARDO MUNOZ ALVAREZ/AFP via Getty Images)

Lucas Pouille of France (L) and Rafael Nadal of Spain switch sides during the tie break of their US Open Men's Singles match at the USTA Billie Jean King National Tennis Center in New York on September 4, 2016.
Fourteen-time Grand Slam champion Rafael Nadal was sent crashing out of the US Open on Sunday, falling in a five-set thriller to 22-year-old Frenchman Lucas Pouille. Pouille, ranked 25th in the world, reached the quarter-finals with a 6-1, 2-6, 6-4, 3-6, 7-6 (8/6) triumph.
 / AFP / EDUARDO MUNOZ ALVAREZ        (Photo credit should read EDUARDO MUNOZ ALVAREZ/AFP via Getty Images)