Argentine Federico Delbonis loses in the semi-finals of the German Tennis Championships . Federer beaten by world No.114 Roger Federer in straight sets . `` After I lost at Wimbledon , I thought this is a good time to go and test the racquets , to take a bit of time off and then add some tournaments and see was there enough time to change or not . ` The German 17-time grand slam winner is trialling a new racquet with a larger frame . Wimbledon said early Federer exit was a good time to make the switch .
Argentine Federico Delbonis loses in the semi-finals of the German Tennis Championships . Federer beaten by world No.114 Roger Federer in straight sets . The German 17-time grand slam winner is trialling a new racquet with a larger frame . Wimbledon said early Federer exit was a good time to make the switch .