Enjoying strong support from a parochial crowd, the former No. 1-ranked Osaka dominated the match with her powerful groundstrokes and broke Pavlyuchenkova's serve twice to take the opening set in 31 minutes.
Top-seeded Osaka didn't ease off in the second set, denying the Russian any chance of getting a foothold in the match, and closed out with an ace.
It is Osaka's first title in the country of her birth -- she lost finals in Tokyo in 2016 and '18 -- and fourth in her career. She won back-to-back majors at the 2018 U.S. Open in 2018 and the Australian Open in January.