Roger Federer advances
The four-time Hamburg champion is playing his first tournament since losing in the second round of Wimbledon.
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Federer won only three of 13 break points and needed six match points to close out the match. He did it with his seventh ace, shortly after producing a spectacular overhead smash winner with a flick of the wrist while stepping back in the final game.
The 17-time Grand Slam champion needed five set points to end the first set, finally earning it when Hajek netted a forehand.
The German led 5-2 in the second set but dropped serve. He then wasted two match points on Berlocq's serve before using his fourth to close out the second-round encounter, hitting a cross-court forehand winner. Berlocq won his first title last week in Bastad, Sweden.
Fourth-seeded Wimbledon semifinalist Jerzy Janowicz of Poland was forced to retire with a right arm injury, allowing 14th-seeded Fernando Verdasco to advance. The Spaniard, who was leading 7-5, 4-0, will play Argentine qualifier Federico Delbonis, who beat Dmitry Tursunov of Russia 6-4, 6-3.
Copyright 2013 by The Associated Press