Federer entered the Hamburg clay-court tournament to try and rediscover some form after a dismal Wimbledon . Roger Federer loses in the semi-finals of the German Tennis Championships . Federer beaten by world No.114 Argentine Federico Delbonis in straight sets . The Swiss 17-time grand slam winner is trialling a new racquet with a larger frame . Federer has been playing his first tournament since Wimbledon last year and will be hoping to get back on track after losing in the semifinals at Roland Garros this year.
Roger Federer loses in the semi-finals of the German Tennis Championships . Federer beaten by world No.114 Argentine Federico Delbonis in straight sets . The Swiss 17-time grand slam winner is trialling a new racquet with a larger frame . Federer has been playing his first tournament since Wimbledon last year and will be hoping to get back on track after losing in the semifinals at Roland Garros this year.