Madison Keys (12), United States, def. Wang Qiang, China, 6-1, 6-4.

Kristina Mladenovic (11), France, def. Peng Shuai, China, 6-2, 6-4.

Petra Kvitova (16), Czech Republic, def. Cagla Buyukakcay, Turkey, 6-0, 6-3.

Johanna Konta (10), Britain, def. Bernarda Pera, United States, 7-6 (5), 6-1.

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Alize Cornet, France, def. Anett Kontaveit, Estonia, 6-2, 6-1.

Anastasija Sevastova (13), Latvia, def. Donna Vekic, Croatia, 6-3, 6-4.

Marketa Vondrousova, Czech Republic, def. Yulia Putintseva, Kazakhstan, 6-3, 6-1.

Sorana Cirstea, Romania, def. Maria Sakkari, Greece, 6-2, 6-3.

Magdalena Rybarikova (14), Slovakia, def. Fatma Al Nabhani, Oman, 6-3, 6-1.

Sam Stosur, Australia, def. Irina-Camelia Begu, Romania, 6-4, 6-2.

Carina Witthoeft, Germany, def. Tatjana Maria, Germany, 6-3, 6-0.

Barbora Strycova, Czech Republic, def. Aleksandra Krunic, Serbia, 6-4, 6-4.

Elise Mertens (15), Belgium, def. Timea Babos, Hungary, 2-6, 6-1, 6-1.

Carla Suarez Navarro, Spain, def. Kateryna Bondarenko, Ukraine, 3-6, 6-3, 6-3.

Julia Goerges (9), Germany, def. Lucie Safarova, Czech Republic, 6-1, 7-5.

Garbine Muguruza (4), Spain, def. Duan Ying-Ying, China, 6-3, 6-4.

Caroline Garcia (7), France, def. Dominika Cibulkova, Slovakia, 6-3, 6-7 (3), 6-0.

Chan Hao-ching, Taiwan, and Yang Zhaoxuan (7), China, def. Oksana Kalashnikova, Georgia, and Lidziya Marozava, Belarus, 6-1, 4-6, 10-2.

Miyu Kato and Makoto Ninomiya, Japan, def. Fatma Al Nabhani, Oman, and Jessy Rompies, Indonesia, 6-4, 6-0.

Andreja Klepac, Slovenia, and Maria Jose Martinez Sanchez (8), Spain, def. Anna Smith, Britain, and Renata Voracova, Czech Republic, 6-3, 6-3.

Mihaela Buzarnescu, Romania, and Alize Cornet, France, def. Alicja Rosolska, Poland, and Abigail Spears, United States, 2-6, 6-4, 10-6.

Barbora Krejcikova and Katerina Siniakova, Czech Republic, def. Irina-Camelia Begu and Monica Niculescu (6), Romania, 2-6, 6-2, 10-2.

Gabriela Dabrowski, Canada, and Jelena Ostapenko, Latvia, def. Nicole Melichar, United States, and Kveta Peschke, Czech Republic, 4-6, 6-1, 10-8.

Veronika Kudermetova and Alla Kudryavtseva, Russia, def. Mubaraka Al-Naimi, Qatar, and Ons Jabeur, Tunisia, 6-2, 6-0.