DarthFed said:
The adjustments that can be made are mostly mental. He has to dig in and focus every point. Aside from that the adjustment everyone has been waiting for (if you are a fan) is for him to FINALLY take a few steps back on the return. His ROS is the biggest weakness that can be improved. It's unlikely he will start moving well again and therefore his defense is a relative weakness from here on out, but the ROS can get better if he gives himself some more time.
Darth, I don't see the ROS thing happening . Roger lives on the baseline, and he tries to cut the angle of the serves that comes to his backhand on the ad court. If he moves back, he will have to hit those returns way behind and way outside of the court, and he will have to cover a whole lot of ground on his forehand side, which he does not like anyways.
He can move a bit back on the deuce court though, without compromising too much, since backhand serves come inside the court and if someone goes out wide, he is better at running to his backhand side than to his forehand.
I agree about the mental part though. He seems to lose his way on the court and totally give away a service game, and that is all it takes against top guys. I am pretty sure his mentality is "Whatever, i can get it back anytime I want" but he has to realize those days are gone.