Zheng Qinwen (7), China, def. Naomi Osaka, Japan, 6-2, 6-4.
Madison Keys (18), United States, def. Sorana Cirstea (28), Romania, 6-2, 6-1.
Mate Pavic, Croatia, and Marcelo Arevalo-Gonzalez, El Salvador, def. Edouard Roger-Vasselin, France, and Santiago Gonzalez (5), Mexico, 6-1, 6-2.