Washington-Sana
American Frances Tiavoy qualified for the quarter-finals of the US Open.
Tiafoe qualified after defeating Spain's Rafael Nadal, ranked third in the world, in three sets to one, 6-4, 6-4, 6-3, 4-6, after three hours and 34 minutes of play.
In the next round, Francis Tiafoe will meet Russian Andrey Rublev.
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