Dusan Lajovic, Serbia, def. Filip Horansky, Slovakia, 6-4, 7-5.

Cameron Norrie, Britain, def. Maximilian Marterer, Germany, 6-1, 6-4.

John Isner (2), United States, def. Radu Albot, Moldova, 7-6 (3), 6-3.

Taylor Fritz, United States, def. Jack Sock (3), United States, 7-6 (6), 6-2.

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Mikhail Kukushkin, Kazakhstan, def. Federico Coria, Argentina, 6-2, 6-3.

Gilles Simon, France, def. Joris De Loore, Belgium, 7-6 (3), 6-2.

Guillermo Garcia-Lopez, Spain, and Divij Sharan, India, def. Ken and Neal Skupski, Britain, 6-7 (7), 7-6 (8), 10-8.