Yulia Putintseva (Kazakhstan) vs Petra Martic (Kroasia)
Naomi Osaka (Jepang) vs Anett Kontaveit (Estonia)
Shelby Rogers (AS) vs Petra Kvitova (Rep Ceko)
Alize Cornet (Prancis) vs Tsvetana Pironkova (Bulgaria)
Maria Sakkari (Yunani) vs Serena Williams (AS)
Victoria Azarenka (Belarusia) vs Karolina Muchova (Rep Ceko)
Elise Mertens (Belgia) vs Sofia Kenin (AS)