Angelique Kerber (GER) [7] - Madison Brengle (USA)
Laura Siegemund (GER) - Annika Beck (GER)
Victoria Azarenka (BLR) [14] - Naomi Osaka (JPN) [Q]
Barbora Strycova (CZE) - Garbiñe Muguruza (ESP) [3]
Johanna Konta (GBR) - Denisa Allertova (CZE)
Ekaterina Makarova (RUS) [21] - Karolina Plíšková (CZE) [9]
Madison Keys (USA) [15] - Ana Ivanovic (SRB) [20]
Varvara Lepchenko (USA) - Shuai Zhang (CHN) [Q]