James Duckworth, Australia, def. Miomir Kecmanovic, Serbia, 6-4, 6-3.

Facundo Diaz Acosta, Argentina, def. Thiago Agustin Tirante (8), Argentina, 6-7 (3), 6-1, 6-4.

Adrian Mannarino, France, def. Aleksandar Vukic, Australia, 7-6 (4), 4-6, 6-3.

Nikoloz Basilashvili, Georgia, def. Marin Cilic, Croatia, 6-2, 7-5.

Mikhail Kukushkin, Kazakhstan, def. Stefanos Sakellaridis, Greece, 7-6 (4), 7-6 (3).

Jason Kubler and John Peers, Australia, def. Tomas Martin Etcheverry, Argentina, and Luciano Darderi, Italy, 4-6, 7-6 (8), 10-5.

Alexander Donski, Bulgaria, and Filip Pieczonka, Poland, def. Arthur Reymond and Luca Sanchez, France, 6-2, 6-1.