Top Half
Serena Williams (USA) [1] - Camila Giorgi (ITA)
Su-Wei Hsieh (TPE) - Jelena Ostapenko (LAT)
Urszula Radwanska (POL) - Ana Konjuh (CRO)
Daria Kasatkina (RUS) - Anna Karolína Schmiedlová (SVK) [27]
Sara Errani (ITA) [17] - Margarita Gasparyan (RUS)
Kurumi Nara (JPN) - Oceane Dodin (FRA) (WC)
Mariana Duque-Mariño (COL) - Xinyun Han (CHN) (WC)
Yulia Putintseva (KAZ) - Caroline Wozniacki (DEN) [16]
Belinda Bencic (SUI) [12] - Alison Riske (USA)
Heather Watson (GBR) - Timea Babos (HUN)
Ajla Tomljanovic (AUS) - Kateryna Bondarenko (UKR)
Daniela Hantuchova (SVK) - Svetlana Kuznetsova (RUS) [23]
Anastasia Pavlyuchenkova (RUS) [26] - Lauren Davis (USA)
Magdalena Rybáriková (SVK) - Yanina Wickmayer (BEL)
Aliaksandra Sasnovich (BLR) - Evgeniya Rodina (RUS)
Nao Hibino (JPN) - Maria Sharapova (RUS) [5]
Agnieszka Radwanska (POL) [4] - Christina McHale (USA)
Eugenie Bouchard (CAN) - Aleksandra Krunic (SRB)
Magda Linette (POL) - Monica Puig (PUR)
Kristyna Plíšková (CZE) [Q] - Samantha Stosur (AUS) [25]
Sloane Stephens (USA) [24] - Qiang Wang (CHN) [Q]
Lourdes Domínguez Lino (ESP) - Anna-Lena Friedsam (GER)
Anna Tatishvili (USA) - Irina Falconi (USA)
Tamira Paszek (AUT) [Q] - Roberta Vinci (ITA) [13]
Carla Suárez Navarro (ESP) [10] - Viktorija Golubic (SUI) [Q]
Maria Sakkari (GRE) [Q] - Yafan Wang (CHN) [Q]
Monica Niculescu (ROU) - Teliana Pereira (BRA)
Elizaveta Kulichkova (RUS) - Andrea Petkovic (GER) [22]
Kristina Mladenovic (FRA) [28] - Dominika Cibulkova (SVK)
Nicole Gibbs (USA) [Q] - Klara Koukalová (CZE)
Daria Gavrilova (AUS) - Lucie Hradecká (CZE)
Luksika Kumkhum (THA) [Q] - Petra Kvitova (CZE) [6]
Bottom Half
Angelique Kerber (GER) [7] - Misaki Doi (JPN)
Storm Sanders (AUS) (WC) - Alexandra Dulgheru (ROU)
Madison Brengle (USA) - Coco Vandeweghe (USA)
Johanna Larsson (SWE) - Irina-Camelia Begu (ROU) [29]
Jelena Jankovic (SRB) [19] - Polona Hercog (SLO)
Laura Siegemund (GER) - Kiki Bertens (NED)
Priscilla Hon (AUS) (WC) - Annika Beck (GER)
Katerina Siniakova (CZE) - Timea Bacsinszky (SUI) [11]
Victoria Azarenka (BLR) [14] - Alison Van Uytvanck (BEL)
Samantha Crawford (USA) (WC) - Danka Kovinic (MNE)
Naomi Osaka (JPN) [Q] - Donna Vekic (CRO)
Victoria Duval (USA) - Elina Svitolina (UKR) [18]
Caroline Garcia (FRA) [32] - Barbora Strycova (CZE)
Mona Barthel (GER) - Vania King (USA)
Kirsten Flipkens (BEL) - Mirjana Lucic-Baroni (CRO)
Anett Kontaveit (EST) - Garbiñe Muguruza (ESP) [3]
Venus Williams (USA) [8] - Johanna Konta (GBR)
Carina Witthoeft (GER) - Saisai Zheng (CHN)
Bethanie Mattek-Sands (USA) - Denisa Allertova (CZE)
Petra Cetkovska (CZE) - Sabine Lisicki (GER) [30]
Ekaterina Makarova (RUS) [21] - Maddison Inglis (AUS) (WC)
Tatjana Maria (GER) - Olga Govortsova (BLR)
Andreea Mitu (ROU) - Julia Goerges (GER)
Kimberly Birrell (AUS) (WC) - Karolina Plíšková (CZE) [9]
Madison Keys (USA) [15] - Zarina Diyas (KAZ)
Tsvetana Pironkova (BUL) - Yaroslava Shvedova (KAZ)
Anastasija Sevastova (LAT) [Q] - Jarmila Wolfe (AUS)
Tammi Patterson (AUS) (WC) - Ana Ivanovic (SRB) [20]
Lesia Tsurenko (UKR) [31] - Varvara Lepchenko (USA)
Lara Arruabarrena (ESP) - Maryna Zanevska (UKR) [Q]
Bojana Jovanovski (SRB) - Alizé Cornet (FRA)
Shuai Zhang (CHN) [Q] - Simona Halep (ROU) [2]