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Playing her first final of the season, Sindhu looked a bit anxious and failed to match the brilliance of Yamaguchi, whom she had beaten in the last four meetings.
The unseeded Praneeth recorded a comfortable 21-17, 21-13 win over the Japanese shuttler Kento Nishimoto in just 42 minutes.
Sindhu and Srikanth prevailed over Japanese shuttlers Aya Ohori and Kenta Nishimoto in women's and men's singles respectively.
Chen, who won at Australia, Swiss and All England this year, has been the most prolific player this season and looked good in the first game but a fighting Sindhu held her own in the opening game and then completely dominated the second to seal the final spot.
Fifth-seeded Sindhu downed third seed Okuhara 21-14, 21-7 in just 44 minutes. She will take on second seed Chen Yu Fei of China in the semifinals.
H S Prannoy, who had knocked out Kidambi Srikanth in the opening round, lost to Rasmus Gemke of Denmark 9-21, 15-21.
Saina Nehwal will return to the circuit in the BWF Super 500 event after missing back-to-back tournaments.
Fifth seed Sindhu, who had made early exits in China and Korea, got back her bearing as she overcame former World Junior Champion Gregoria 22-20 21-18 in 38 minutes to keep her 5-0 record intact against the Indonesian.
It turned out to be a dismal day for Indian shuttlers as P V Sindhu, B Sai Praneeth, Sameer Verma, and the men's doubles pair of Satwiksairaj Rankireddy and Chirag Shetty all went down in straight games.
The world number six Sindhu, who has been struggling of late, beat Li 21-15 21-13 in a match that last 44 minutes.
Results 301-310 of 352
