Grigor Dimitrov (4), Bulgaria, def. David Goffin (6), Belgium, 6-4, 7-6 (5).

Rafael Nadal (1), Spain, def. Dominic Thiem (5), Austria, 6-0, 6-2.

Kei Nishikori, Japan, def. Marin Cilic (2), Croatia, 6-4, 6-7 (1), 6-3.

Alexander Zverev (3), Germany, def. Richard Gasquet, France, 4-6, 6-2, 7-5.

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Simone Bolelli and Fabio Fognini, Italy, def. Raven Klaasen, South Africa, and Michael Venus, New Zealand, 7-6 (8), 6-3.

Bob and Mike Bryan (4), United States, def. Pablo Cuevas, Uruguay, and Marcel Granollers, Spain, 7-6 (5), 6-7 (5), 10-5.

Oliver Marach, Austria, and Mate Pavic (3), Croatia, def. Grigor Dimitrov, Bulgaria, and David Goffin, Belgium, walkover.

Rohan Bopanna, India, and Edouard Roger-Vasselin, France, def. Juan Sebastian Cabal and Robert Farah, Colombia, 6-4, 6-4.