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Montreal qualifier Gabriel Diallo upset 24th-seeded Arthur Fils of France 7-5, 6-7 (3), 6-4, 6-4 Thursday in second-round play at the US Open.
After winning the second set, the 20-year-old Fils went up 3-2 in the third before Diallo won four consecutive games to take the set. The 143rd-ranked Diallo did the same in the fourth set to win the match, which lasted three hours and 29 minutes.
Diallo, 22, is set to face 14th-seeded Tommy Paul of the United States in the third round.