Roger Federer struggled in his first match since his Wimbledon humiliation when he had to come back from a set down to defeat Germany's Daniel Brands in his Hamburg ATP opener on Wednesday.
The 31-year-old, top-seeded Federer won 3-6 6-3 6-2 against the world No.58 to reach the third round of a tournament he last played in 2008.
Federer, now ranked No.5 in the world, his lowest point for a decade, goes on to face Jan Hajek of the Czech Republic for a quarter-final spot.
The Swiss great is using this event and the Gstaad tournament, which starts on July 22, to bounce back from his shock Wimbledon exit ahead of next month's US Open.
Federer crashed out of Wimbledon, where he was the seven-time champion, at the hands of Ukraine's 116-ranked Sergiy Stakhovsky in his worst grand slam defeat for a decade.
The second round loss ended his run of 36 consecutive grand slam quarter-final appearances, having not gone out of a major before the last eight since the 2004 French Open.
Hajek reached the third round with a 6-4 2-6 6-4 win over Latvian 15th seed, Ernests Gulbis.
Tommy Haas, who first competed at Hamburg in 1997, will play in-form Carlos Berlocq in the third round.
Second seed Haas was made to work hard for a 6-1 4-6 6-4 victory over qualifier Blaz Kavcic of Slovenia.
Last week's Swedish Open champion, Berlocq, continued his run of form by beating Slovak 16th seed Martin Klizan 4-6 6-1 7-6 (7-5).
Argentine fifth seed Juan Monaco got his title defence off to a winning start when he beat Gael Monfils 6-4 6-4 in 73 minutes for a place in the third round.
Qualifier and world No.114 Federico Delbonis held his nerve to knock out 2006 champion Tommy Robredo, the 10th seed, 6-1 4-6 6-4.
Guillermo Garcia-Lopez improved to 5-1 in his head-to-head record against 13th seed Mikhail Youzhny in a 6-3 6-7 (3-7) 6-2 win.
Youzhny saved six match points in the second set.
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