Stuttgart, Germany - Nicolas Kiefer was hoping to line up against a German Davis Cup teammate in the quarter-finals of the Mercedes Cup after securing his own spot in the last eight 6-3, 6-4 over compatriot Simon Greul Thursday.

Kiefer, 32, playing the event for the first time in a dozen years, was hoping for a victory later from fifth-seeded German Philipp Kohlschreiber over Polish qualifier Lukas Kubot in their second-round encounter.

"It would be great if Philip could win his match," said Kiefer after his victory in an hour and a quarter. "That way we would have a German safely into the semi-finals for sure."

Perth, Australia  - Nicolas Kiefer was taken off in a wheelchair on Thursday, victim of a freak ankle injury as Slovakia reached the final of the eight-nation team competition when Germany could not go on.

Kiefer, 31, was watching a return from Dominik Hrbaty sail out over the baseline when he put his weight wrongly on his right ankle and crumbled to the court at the Burswood Dome.

The German, leading 3-1 and with advantage in the fifth game, lay there in pain until he was taken away for treatment.