Top-seeded Janko Tipsarevic in quarterfinals in Munich with straight-set win over Grega Zemlja

Top-seeded Janko Tipsarevic of Serbia defeated Grega Zemlja of Slovenia 6-4, 6-2 to reach the quarterfinals of the BMW Open on Thursday.

Third-seeded Tommy Haas overcame Ernests Gulbis 6-4, 6-7 (3), 6-2 to set up a quarterfinal with Florian Mayer. The sixth-seeded Mayer beat Marinko Matosevic 2-6, 6-4, 6-2.

The 35-year-old Haas, a finalist in 2000, is bidding to win the title for the first time in his 10th appearance.

Daniel Brands will play Gael Monfils later Thursday, with the winner to face Tipsarevic in the quarterfinals.