With a powerful start, Sindhu dominated the game as she won four of the first five points, sending the opponent on the backfoot. She was leading 15-2 in the first match for a moment, eventually winning it 21-7.
In the second game, she won the first two points and further dominated the game. She won the second game 21-7 in 20 minutes.
Sindhu had defeated China's Chen Yu Fei 21-7, 21-14 to enter the finals on Saturday.
This is the second time that Indian shuttlers will be returning with two medals from World Championships (Sai Praneeth and PV Sindhu), previously in 2017, Saina Nehwal had won bronze and PV Sindhu won silver.
World number four Okuhara had no answers to the aggressive approach from the Indian shuttler