Ivan Dodig of Croatia caused another upset at the BMW Open on Friday by ousting fifth-seeded Alexandr Dolgopolov of Ukraine 6-4, 6-4 to reach the semifinals.
It was the third straight-sets victory of the week for Dodig, who beat Russian two-time champion Nikolay Davydenko in the first round, and followed up with victory over second-seeded countryman Marin Cilic on Wednesday.
The 56th-ranked Dodig next faces third-seeded Tommy Haas, who defeated fellow German Florian Mayer, the sixth seed, 6-4, 6-1.
Haas, a finalist in 2000, is bidding to win the title for the first time on his 10th appearance.
Defending champion Philipp Kohlschreiber was playing Serbia's Viktor Troicki later, while the other quarterfinal also had a German-Serbian matchup, with top seed Janko Tipsarevic facing Daniel Brands.