HANNOVER, Germany (AP) Lukas Rosol defeated 18-year-old Davis Cup debutant Alexander Zverev 6-2, 6-3, 6-1 to book a place for the Czech Republic in the quarterfinals with a 3-2 win over Germany on Sunday.
Rosol, ranked 50th in the world, had 13 aces and converted half of his 12 break points to win in 1 hour, 38 minutes.
''It's bitter that I lost the decisive match,'' Zverev said. ''I tried everything but today I don't know what I could do.''
Earlier, Philipp Kohlschreiber leveled the first-round tie at 2-2 after Tomas Berdych retired due to a right thigh injury with the German leading 6-3, 7-5.
Berdych, ranked 7th in the world, retired after more than 100 minutes against Germany's top player. Berdych had received lengthy treatment after the fifth game of the first set.
''I think it was the second or third game when I ran for a drop shot and then stretched for the passing shot and I felt pain in my right hamstring,'' Berdych said.
Kohlschreiber converted three of his five break points while Berdych failed on any of his eight chances.
The Czech Republic next faces France in July's quarterfinals as it bids for its third title in five years.
Germany goes into September's playoffs after its second successive first-round exit.