Donna Vekic (6), Croatia, def. Vera Lapko, Belarus, 6-2, 7-6 (6).

Katie Boulter, Britain, def. Sam Stosur, Australia, 7-6 (6), 6-1.

Johanna Konta (4), Britain, def. Heather Watson, Britain, 6-4, 7-6 (5).

Ashleigh Barty (1), Australia, def. Duan Ying-Ying, China, 6-3, 6-2.

Advertisement

Lizette Cabrera, Australia, and Irina Falconi, United States, def. Daria Gavrilova, Australia, and Donna Vekic, Croatia, walkover.

Mihaela Buzarnescu, Romania, and Heather Watson, Britain, def. Priscilla Hon, Australia, and Dalila Jakupovic, Slovenia, 7-6 (2), 6-3.