I just saw him hit a swinging topspin forehand style volley at the net. pitiful.
it was such an easy put away volley anyway. he should have hit the bloody volley right. even against dolgo he shows no inclination to play the right away.
he is also running around his backhand too much.
but like you said, the dude is burned mentally and physically. his style of play is too demanding and it takes its toll by the end of the season.