介绍:
World number two Roger Federer comfortably beat Latvian Ernests Gulbis 6-3 7-5 on Wednesday to move into the last eight of the Halle Open where he will meet Germany's Florian Mayer.
Czech Tomas Berdych, the third seed, also advanced, beating Croatian teenager Borna Coric in straight sets.
Ivo Karlovic also booked a last eight spot with a 6-7(5) 6-3 6-3 victory over German Alexander Zverev.
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