HALLE, Germany — Mischa Zverev rallied to upset fifth-seeded Tomas Berdych 3-6, 6-2, 7-6 (8) Wednesday and reach the quarterfinals of the Gerry Weber Open.

Zverev, a German wild card, wasted three match points in the tiebreaker, then saved two before overcoming the 2007 tournament champion.

It is the fourth time this year that the 21-year-old German has reached the quarterfinals.

Lukas Lacko advanced to the second round by beating Harel Levy 7-6 (6), 6-2. Lacko lost to Levy in the final round of qualifying but got a place in the main draw after the withdrawal of top-seeded Roger Federer.

On Tuesday, Federer withdrew from the tournament, saying he was "overwhelmed" and "exhausted" after his French Open win.