Top-seeded Kei Nishikori opened his bid for a fourth straight Memphis Open title with a 6-2, 7-5 victory over Ryan Harrison. Nishikori will next face Mikhail Kukushkin, who upset fifth-seeded Denis Kudla, 6-1, 7-5.
u25a0 Second-seeded Marin Cilic reached the World Tennis Tournament quarterfinals in Rotterdam, the Netherlands, by defeating Gilles Müller, 7-6 (2), 7-6 (7), in the second round. Cilic next plays Philipp Kohlschreiber, who won against the qualifier Ivan Dodig, 6-4, 6-2. Fifth-seeded Gaël Monfils beat Borna Coric, 6-3, 5-7, 6-2, in a match littered with 22 break-point chances.
u25a0 Fifth-seeded Dominic Thiem, at 22 the youngest player in the top 20 of the world rankings, reached a quarterfinal for the second time of this young season when he defeated the qualifier Gastao Elias, 3-6, 7-6 (7), 6-3, in the Argentina Open in Buenos Aires.