The thinking behind his three centre-back formation is that Brazil press opponents back, with the strikers working hard to regain possession of the ball close to the opposing goal.
Mr Balls said it would be the first time that all issues which affected children aged up to 19 would be brought together in one department, stating the priority was to put children "at the centre" of government thinking.
Wimbledon's closed roof made for a fascinating atmosphere on Centre Court later in the day, but Federer was already showered and changed and thinking of a third round meeting with France's Julien Benneteau -- who beat American Michael Russell -- as he bids to equal Pete Sampras' record of seven Wimbledon titles.