HALLE, Germany (AP) Robin Haase upset second-seeded Dominic Thiem 6-3, 7-6 (7) in the second round of the Gerry Weber Open on Wednesday.
The 42nd-ranked Haase saved four of five break points as he advanced to the quarterfinals at the grass-court tournament. The Dutchman next faces Richard Gasquet of France, who defeated Australia's Bernard Tomic 6-3, 6-3.
Fourth-seeded Alexander Zverev maintained his good form with a 6-3, 6-4 defeat of German compatriot and 2011 champion Philipp Kohlschreiber.
The 20-year-old Zverev, who opened with a 6-3, 6-2 defeat of Paolo Lorenzi on Tuesday, fired 10 aces and didn't face a break point.
Zverev next plays seventh-seeded Roberto Bautista Agut, who defeated German wild card Dustin Brown 6-4, 1-6, 7-6 (6).