Karolina Pliskova (1), Czech Republic, def. Naomi Osaka, Japan, 6-6, 6-7 (4), 1-0 retired.

Caroline Garcia, France, def. CiCi Bellis, United States, 6-4, 6-2.

Caroline Wozniacki (6), Denmark, def. Agnieszka Radwanska (10), Poland, 6-3, 6-1.

Lucie Safarova, Czech Republic, def. Ekaterina Makarova, Russia, 6-3, 6-7 (3), 6-2.

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Simona Halep (2), Romania, def. Barbora Strycova, Czech Republic, 6-1, 6-0.

Sloane Stephens, United States, def. Angelique Kerber (3), Germany, 6-2, 6-2.

Elina Svitolina (5), Ukraine, def. Venus Williams (9), United States, 6-2, 6-1.

Garbine Muguruza (4), Spain, def. Ashleigh Barty, Australia, 6-0, 3-6, 6-2.

Lyudmyla Kichenok, Ukraine, and Nicole Melichar, United States, def. Chuang Chia-jung, Taiwan, and Renata Voracova, Czech Republic, 6-4, 6-3.

Gabriela Dabrowski, Canada, and Jelena Ostapenko, Latvia, def. Julia Goerges, Germany, and Olga Savchuk, Ukraine, 4-6, 6-2, 10-3.

Anna Groenefeld, Germany, and Kveta Peschke (8), Czech Republic, def. Eugenia Bouchard, Canada, and Karolina Pliskova, Czech Republic, 7-5, 1-6, 11-9.

Ekaterina Makarova and Elena Vesnina (1), Russia, def. Bianca Andreesu and Carson Branstine, Canada, 6-1, 6-1.