Reigning US Open champion Emma Raducanu, the 19-year-old British second seed, reached the Washington Open second round by defeating American Louisa Chirico 6-4, 6-2 on Tuesday.
World No 10 Raducanu won her first match since a second-round Wimbledon exit to book a last-16 match against Colombia’s María Camila Osorio.
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Former world No 1 Victoria Azarenka, a two-time Australian Open champion and three-time US Open runner-up, beat Ukraine’s Dayana Yastremska 6-4, 6-0.
American Mackenzie McDonald, the 2021 Washington runner-up, lost his opener 1-6, 6-4, 6-4 to Finland’s Emil Ruusuvuori, who meets Polish second seed Hubert Hurkacz next.