Rafael Nadal (1) - Stan Wawrinka 7-5, 7-6(4)
Marin Cilic (6) - Diego Schwartzman (11) 6-3, 6-2
Robin Haase - Denis Shapovalov 7-5, 6-2
Karen Khachanov - John Isner (8) 7-6(5), 7-6(1)
Grigor Dimitrov (5) - Frances Tiafoe 7-6(1), 3-6, 7-6(4)
Kevin Anderson (4) - Iiya Ivashka 7-5, 6-3
Stefanos Tsitsipas - Novak Djokovic 6-3, 6-7(5) 6-3
Alexander Zverev (2) - Daniil Medvedev 6-3, 6-2.
Robin Haase vs Karen Khachanov
Grigor Dimitrov (5) vs Kevin Anderson (4)
Stefanos Tsitsipas vs Alexander Zverev (2).