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Munich - Marin Cilic of Croatia, last year's runner-up, advanced to the quarter-finals of the BMW Open on Thursday by beating Horacio Zeballos of Argentina 6-3, 7-6 (7).
Cilic fired eight aces and lost only seven points behind his first serve while breaking Zeballos's serve three times. The third-seeded Cilic is the highest seeded player left in the last eight. He has reached the quarter-finals in Munich for the fourth time in four tries.
Seventh-seeded Nikolay Davydenko of Russia rallied to beat German qualifier Julian Reister 3-6, 7-6 (5), 6-1. Davydenko won the tournament in 2004.
Cilic and Davydenko, a former No. 3 in the world, will play each other in the quarter-finals.
Another former Munich champion, Philipp Kohlschreiber, won an all-German match against "lucky loser" Denis Gremelmayr 6-3, 6-3.
The eighth-seeded Kohlschreiber saved the four break points he faced and converted three of six opportunities. He won the title in Munich in 2007.
In his second quarter-final of the year, Kohlschreiber will face Radek Stepanek, who outlasted German wild card Dustin Brown 7-6 (6), 6-7 (5), 6-3 despite squandering a 5-2 lead in the second set.
Fifth-seeded Florian Mayer of Germany edged Teymuraz Gabashvili of Russia 6-4, 7-6 (1) to set up a quarte-rfinal showdown with Bulgarian teenager Grigor Dimitrov, who advanced on Wednesday.
In another quarter-final on Friday, Philipp Petzschner of Germany plays Potito Starace of Italy.
