Fed surely didn't merely lose to Djokovic in his latest couple of appearances at GS tournaments. Seppi, anyone? Cilic, perhaps?
Fed's main problem is that he'll have to play sublime tennis during a couple of matches in a row, and I very much doubt he'll ever be able to do so again at his age. Nothing to be ashamed about btw - reaching yet another Wimbledon final in 2015 was quite a bit more than I hoped for before the tournament actually started. He's doing pretty well, still.
à la Vanioman:
it's ok.