S-HERTOGENBOSCH, Netherlands (AP) Fifth-seeded Ivo Karlovic of Croatia smacked 25 aces as he beat Tatsuma Ito of Japan 7-6 (5), 7-6 (3) to reach the Topshelf Open quarterfinals on Wednesday.
There, he'll face local favorite Robin Haase, who beat seventh-seeded Fernando Verdasco of Spain 7-6 (4), 6-3.
Verdasco had 10 aces, but lost the only service game of the second-round match.
In women's play, third-seeded Coco Vandeweghe of the United States; No. 5 Camila Giorgi of Italy, and No. 7 Kristina Mladenovic of France reached the last eight.
Vandeweghe won 7-5, 6-4 against Tatjana Maria; Mladenovic rallied past Kurumi Nara 6-7 (4), 6-3, 6-3, and Giorgi withstood 21 aces from Michaella Krajicek in a 6-7 (2), 6-2, 6-4 win.
Yaroslava Shvedova of Kazakhstan, who eliminated top-seeded Eugenie Bouchard in the first round, beat Marina Erakovic of New Zealand 6-4, 6-4.