Garbine Muguruza (4), Spain, def. Kirsten Flipkens, Belgium, 7-5, 6-2.

CiCi Bellis, United States, def. Svetlana Kuznetsova (8), Russia, 6-4, 7-5.

Caroline Garcia, France, def. Varvara Lepchenko, United States, 6-1, 6-4.

Lucie Safarova, Czech Republic, def. Dominika Cibulkova (11), Slovakia, 6-2, 6-4.

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Ashleigh Barty, Australia, def. Elena Vesnina (16), Russia, 6-3, 5-7, 6-4.

Karolina Pliskova (1), Czech Republic, def. Anastasia Pavlyuchenkova, Russia, 6-3, 6-3.

Venus Williams (9), United States, def. Katerina Siniakova, Czech Republic, 7-5, 7-5.

Agnieszka Radwanska (10), Poland, def. Timea Babos, Hungary, 6-0, 6-1.

Naomi Osaka, Japan, def. Anastasija Sevastova (15), Latvia, 6-3, 6-4.

Ekaterina Makarova, Russia, def. Johanna Konta (7), Britain, 5-7, 7-6 (4), 6-3.

Lyudmyla Kichenok, Ukraine, and Nicole Melichar, United States, def. Abigail Spears, United States, and Katarina Srebotnik, Slovenia, 6-3, 3-6, 10-4.

Bianca Andreesu and Carson Branstine, Canada, def. Kristina Mladenovic, France, and Anastasia Pavlyuchenkova, Russia, 7-5, 2-6, 10-8.

Sania Mirza, India, and Peng Shuai (4), China, def. Lauren Davis and Alison Riske, United States, 7-6 (8), 6-3.

Nadiia Kichenok, Ukraine, and Anastasia Rodionova, Australia, def. Raquel Atawo, United States, and Daria Gavrilova, Australia, 6-2, 6-2.

Chan Yung-jan, Taiwan, and Martina Hingis (2), Switzerland, def. Andreja Klepac, Slovenia, and Maria Jose Martinez Sanchez, Spain, 6-1, 7-6 (4).

Lucie Safarova and Barbora Strycova (3), Czech Republic, def. Barbora Krejcikova, Czech Republic, and Monica Niculescu, Romania, 6-2, 6-4.