It is hard to watch this at times but age catches up with everyone.
Fed Loses to another player he shouldn't have lost to.
Fed has a hard day in Hamburg
Can a new racket cause you to lose. Fed doesn't use it as an excuse.
Anyone with considerable skill knows that a racket can change your manner of play or results if you try to maintain your style. The stiffness, balance, weight, and head size are variables on a tennis racket that can alter your game for the positive or negative. I'd give it some time to see if the move to the larger racket head works for Federer. It should give him more power for less work and as he ages that is a good thing. I never thought I'd see Fed with a granny stick.