Starting at 2pm
Aryna SABALENKA (BLR)  v Kiki BERTENS (NED) 
Not before 3.30pm
Donna VEKIC (CRO)  v Vera ZVONAREVA (RUS) [WC]
Margarita GASPARYAN (RUS) / Ekaterina MAKAROVA (RUS) v Lara ARRUABARRENA (ESP) Alexandra PANOVA (RUS)
Bertens last played Sabalenka at last year's French Open, beating her in straight sets, 6-2, 6-1. They have also faced each other in Fed Cup action in 2017, when the Dutchwoman secured the victory for her country, 3-6, 7-6(6), 6-4.
Zvonareva is the last Russian in this year's tournament, defeating compatriots Daria Kasatkina and Ekaterina Makarova en route to the semifinals.
Vekic has never played Zvonareva before. The Croatian was four years of age when the Russian turned professional - in the year 2000.