Nikoloz Basilashvili, Georgia, def. Juan Martin del Potro (1), Argentina, 6-4, 6-4.
Caroline Wozniacki (2), Denmark, def. Anastasija Sevastova, Latvia, 6-3, 6-3.
Lukasz Kubot, Poland, and Marcelo Melo (2), Brazil, de. Oliver Marach, Austria, and Mate Pavic (1), Croatia, 6-1, 6-4.
Andrea Sestini Hlavackova and Barbora Strycova (2), Czech Republic, def. Gabriela Dabrowski, Canada, and Xu Yifan (3), China, 4-6, 6-4, 10-8.
