Roger Federer and a Racquet Change

Honest Assessment Roger Federer has had a few stretches in his career in which decline looked to be steep and imminent.  2008 was the first of these patches.  Novak Djokovic rolled Roger in the Australian Open semifinal round.  Federer was beaten soundly by Mardy Fish in the semifinal round of Indian Wells.  Nadal thrashed Federer…