In this particular match, Djokovic was down a set and the match was slipping out of his hands. However, he went on to win this point and the match. Sometimes the strategy to win isn't obvious, but if you can keep delivering body shots (like in boxing) instead of going for the knockout (1 in 5 shot), good things can happen. Soften them up. In this particular match, Monfils gave in to the mental superiority of Djokovic. Notice how safe the shots were traveling inside the lines and above the net.