Top seed Marin Cilic and Grigor Dimitrov are among those who booked their places in the quarter-finals of the Rotterdam Open on Thursday.
Cilic survived a second-set fightback from countryman Borna Coric to secure a 6-1, 2-6, 6-4 victory after two hours.
“I think we both played really good tennis. I started to get into a good rhythm at the end of that first set but then I lost my serve in the middle of that second set when he came up with some amazing shots,” said Cilic.
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“Obviously, he was showing great fighting spirit and I knew it was going to be tough in that third set. I just tried to be mentally strong. Just a few points decided the outcome.”
The Croat moves on to face Jo-Wilfried Tsonga for a place in the semi-finals.
“It will be a tough match as always," said Cilic. "There isn’t much that will separate us. We both have good serves and powerful games. I’ll have to be mentally strong and keep up my good tennis.”
Dimitrov, meanwhile, defeated Denis Istomin 7-6 (9-7), 6-1 to set up arguably the pick of the quarter-final matches with Belgian David Goffin.
Third-seeded Goffin found himself a set down against Robin Haase but recovered to post a 5-7, 6-4, 6-4 victory.
Fourth seed Tomas Berdych is also still alive in the competition, having dispatched Richard Gasquet 7-6 (7-4), 6-1.
Second seed Daniel Thiem was due in action against Frenchman Gilles Simon in the final match of the day.