Nadal must not believe that his win against Djokovic at Montreal will be enough. He deservedly won the match with aggressive adjustments in the first set and a dominant third-set tiebreaker, but escaped against Djokovic's subpar performance.
He also lost his way a bit in the Montreal match in the second set. One, he quit attacking the center of the court. Two, he got burned on some slice backhands, not a very good option in this matchup. Three, he retreated deeper behind the baseline which took away his backhand effectiveness and angles.
Nadal has done well in using both sides of the court, but especially from inside the deuce corner. By attacking the Djokovic forehand, he can keep Djokovic from teeing off with his backhand. Nadal will usually be able to follow up deuce corner-approach shots and open up the ad side on his own terms.
The Spaniard must continue to be crafty with his serving. He has consistently banged in above 70 percent of his first serves in order to set up his forehand. It's been nearly unbeatable, and if he continues to mix up his forehand replies to both sides of the court, he will keep Djokovic from setting his feet.
He likes to serve to Djokovic's backhand on the deuce court, but at Montreal, he served a lot to Djokovic's forehand on the ad court. He often has excellent sense for when to change up his patterns as needed. This must continue.
Nadal is the most focused player on the ATP tour from one point to the next, but he does have a tendency to suffer through rough patches against his rival. This is largely because Djokovic is so great. The key is for Nadal not to get ruffled, but to keep up his capacity to be a forward thinker and problem solver.