Fed is mentally out of it. As I said in a previous post, he didn't seem all that fired up about losing. Same thing happened when he lost to Delpo last year, sort of like, "eh whatever"
He has twin babies now, puts all this in perspective, right now he has lost a little bit of the killer edge. Plus, that Djoko/Fed match was awful. I mean I have never seen Fed play that bad, missing routine FH/BH, and it still was a 5 setter. Fed demolished a red hot Sod in some nasty conditions and made it seem like it's just a walk in the park.
That's what's scary. He does seem a step slower but I still think it's more mental than physical. I bet once the kids get a little older and away from the baby age in the next 6 months he'll retool and be ready to go.
If PA really helps I think you will see Fed have a more aggressive net game. He would set people up for a zinger FH or BH outright winner but I think to conserve himself he'll work on truncating points. I actually wouldn't be surprised to see all top 10 player sstart adopting all court games now.
The bar to win out in baseland bashing is so high and demanding that once you get past 27-28 it gets really hard to sustain those rallies in terms of pace/depth/angles and chasing things down too. Just look at Roddick, he used to have some heat on his FH, now he tries to outlast players with a baseline game and at his age it's not working. No zip to his FH anymore, just almost pushing. And he never developed a solid all court game where he can come in to close out points. He comes to net and you cringe. Obv Fed/Roddick are worlds apart, Fed at 30 moves better than almost everyone and Roddick has never had good movement but the point is guys like Djoko, Murray, Sod, Berdych, Delpo can bash away now but they need to be focused on longevity, 20 stroke killer rallies within their peer group will just wreck them long-term.