The defending champion told BBC Sport: "I haven't dropped a set getting into the final and I feel fresh and motivated to play well.
"I could see Kei wasn't serving at his best and maybe that was down to injury or feeling fatigued after finishing late against [David] Ferrer.
"Regardless of that I played well and concentrated on what I had to do. I served exceptionally well in important moments and that encourages me for the final."
If Djokovic wins the event, it will be the 20th masters title of his decorated career.