There's no easy way out for Nadal it seems.
Djokovic is more consistent from the baseline.
Nadal isn't getting the points he usually does against everyone with his shots to the side lines, Djokovic ran down countless ones and got them back in play either deep or with adequate pace to get back into the point.
Nadal has to go for more, either by picking up the pace of his shots or getting closer to the lines, more risk and more unforced errors unless he's really zoning.
Djokovic has resolved his endurance issues, he can run down balls all day it seems.
Djokovic is very good in returning, getting the ball back into play and his groung game takes over from there.
The drop shots from Rafa have to be almost perfect, Nole can get to many of these where Rafa would usually get points from.
Djokovic's speed around the court is holding his whole game together.
Then finally mentally, it's there and pretty solid, not too many letdowns as in the past.
Put all this together and Nadal is losing quite a few points here and there.
Since this year the pattern has become pretty constant, it appears Nadal has no answers for now.