At Willian H.G. FitzGerald Tennis Center
Surface: Hardcourt outdoor
WASHINGTON (AP) _ Results Sunday from Citi Open at Willian H.G. FitzGerald Tennis Center (seedings in parentheses):
Nick Kyrgios, Australia, def. Yoshihito Nishioka, Japan, 6-4, 6-3.
Liudmila Samsonova, Russia, def. Kaia Kanepi (6), Estonia, 4-6, 6-3, 6-3.
Jack Sock, United States, and Nick Kyrgios, Australia, def. Frances Tiafoe, United States, and Alex de Minaur, Australia, walkover.
Jack Sock, United States, and Nick Kyrgios, Australia, def. Ivan Dodig, Croatia, and Austin Krajicek (4), United States, 7-5, 6-4.
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