Christina McHale, United States, def. Eudice Chong, Hong Kong, 6-7 (2), 6-2, 6-1.

Daria Gavrilova (7), Australia, def. Zarina Diyas, Kazakhstan, 3-6, 7-5, 6-1.

Monica Niculescu, Romania, def. Ons Jabeur, Tunisia, 4-6, 7-6 (0), 6-4.

Wang Qiang (6), China, def. Ling Zhang, Hong Kong, 6-0, 6-2.

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Nao Hibino, Japan, def. Sam Stosur, Australia, 6-3, 6-3.

Lesley Kerkhove, Netherlands, def. Bibiane Schoofs, Netherlands, 6-4, 6-0.

Zhang Shuai, China, def. Sabina Sharipova, Uzbekistan, 6-3, 7-6 (3).

Ana Bogdan, Romania, def. Caroline Dolehide, United States, 6-7 (2), 6-3, 7-5.

Garbine Muguruza (4), Spain, def. Sara Sorribes Tormo, Spain, 6-3, 6-1.

Elina Svitolina (1), Ukraine, def. Priscilla Hon, Australia, 6-2, 6-3.

Alicja Rosolska, Poland, and Abigail Spears (2), United States, def. Jennifer Brady, United States, and Monica Niculescu, Romania, 6-2, 6-3.

Shuko Aoyama, Japan, and Lidziya Marozava (4), Belarus, def. Aleksandra Krunic, Serbia, and Arina Rodionova, Australia, 4-6, 6-2, 10-8.