0502 GMT November 19, 2019
The Serbian star crushed Australian qualifier John Millman 6-3, 6-2 to mark his 10th win in a tournament main draw debut, AFP reported.
Djokovic, playing in his first Japanese competition, dominated throughout the week, never losing a single set to claim the trophy at the Ariake Colosseum, a venue for the Tokyo 2020 Olympics.
Beaming Djokovic, the winner of 16 Grand Slams, now goes to the Shanghai Masters, where he is the top seed.
"I didn't drop a set, so I played a fantastic tournament. Everything is positive in my experience on and off the court, the way I feel and motivated for Shanghai, going there with great confidence," he said.
"I am hoping I can finish the season in this style," added Djokovic, who was competing for the first time since pulling out of the US Open due to a left shoulder injury.
The triumph in Tokyo has boosted his confidence going into the Olympics too.
"Considering that Olympic Games are high always on my list of goals and priorities and wishes, I wanted to feel the surface and see and experience how it feels playing on this court," Djokovic said.
"I am very glad now, seeing and experiencing how I play (in Ariake) because I feel comfortable. It feels great playing on this court... I am hoping that can also be the case in the Olympics."
In the final, the Serb kept sending sharp returns to deep corners, mixing them with elegant drop shots.
Djokovic fired six aces, never committed a double fault, and scored points on 26 of his 30 successful first serves.
He never faced a break point, while Millman managed to survive only one of four break points during the match.