MUNICH (AP) Roberto Bautista Agut, David Goffin and Philipp Kohlschreiber, the three seeded players in action on Wednesday, all advanced to the quarterfinals of the BMW Open clay-court tournament.
Third-seeded Bautista Agut breezed past qualifier Radek Stepanek 6-0, 6-3 and No. 5 Kohlschreiber dispatched wild card entry Alexander Zverev 6-2, 6-4.
Kohlschreiber is a two-time champion, while the 18-year-old Zverev is the youngest of eight teenagers in the Top 200 of the ATP Rankings.
Fourth-seeded Goffin needed three sets to get past Simone Bolelli 7-6 (5), 6-7 (4), 6-1 and will next face Kohlschreiber.
Victor Estrella Burgos overcame Janko Tipsarevic 6-4, 6-7 (1), 7-5 to set up a match against Bautista Agut, who saved all four break points he faced and hit six aces.
In a first-round match, Pablo Andujar beat Joao Souza 6-4, 6-4. Andujar was runner-up in Barcelona last week and withstood 11 aces to beat Souza.
Top-seeded Andy Murray will be in action on Thursday against German qualifier Mischa Zverev.