Angelique Kerber (GER) [7] - Alexandra Dulgheru (ROU)
Madison Brengle (USA) - Johanna Larsson (SWE)
Jelena Jankovic (SRB) [19] - Laura Siegemund (GER)
Annika Beck (GER) - Timea Bacsinszky (SUI) [11]
Victoria Azarenka (BLR) [14] - Danka Kovinic (MNE)
Naomi Osaka (JPN) [Q] - Elina Svitolina (UKR) [18]
Barbora Strycova (CZE) - Vania King (USA)
Kirsten Flipkens (BEL) - Garbiñe Muguruza (ESP) [3]
Johanna Konta (GBR) - Saisai Zheng (CHN)
Denisa Allertova (CZE) - Sabine Lisicki (GER) [30]
Ekaterina Makarova (RUS) [21] - Tatjana Maria (GER)
Julia Goerges (GER) - Karolina Plíšková (CZE) [9]
Madison Keys (USA) [15] - Yaroslava Shvedova (KAZ)
Anastasija Sevastova (LAT) [Q] - Ana Ivanovic (SRB) [20]
Varvara Lepchenko (USA) - Lara Arruabarrena (ESP)
Alizé Cornet (FRA) - Shuai Zhang (CHN) [Q]