Australia's Daria Gavrilova is the first player through to the quarter-finals of the Hong Kong Open.
Gavrilova, seeded seventh, has advanced with a 6-1 2-6 6-2 win over American Shelby Rogers.
She faces a likely last-eight showdown with Danish former world No.1 and No.3 seed Caroline Wozniacki.
Also on Wednesday, Japan's Naomi Osaka upset second-seeded American veteran Venus Williams, 7-5 6-2.
Russian sixth seed Anastasia Pavlyuchenkova joined Gavrilova the quarter-finals, beating Jacqueline Cako of the US, 7-6 (7-3) 6-1.
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