Kerala's HS Prannoy defeated Malaysia's Liew Daren 22-20 21-19 in the opening round.
World champion Sindhu, who won the opening game, lost to Japans' Sayaka Takahashi in the pre-quarterfinals.
The fifth seed Sindhu clawed back from a game down to notch up a 14-21, 21-15, 21-11 victory over Ohori.
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.
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.
Fifth-seed Sindhu, who is eyeing her first title of the season, defeated Blichfeldt 21-14, 17-21, 21-11 in a match that lasted 62 minutes.
Sindhu and Srikanth prevailed over Japanese shuttlers Aya Ohori and Kenta Nishimoto in women's and men's singles respectively.
Eighth seed Saina will now face either Spain's three-time World Champion and reigning Olympic champion Carolina Marin or China's Chen Yufei, seeded third.
Sindhu defeated local favourite Gregoria Mariska Tunjung 23-21, 21-7 to make the last-eight stage, while eighth seed Srikanth recorded a clinical 21-14, 21-9 win over Japan's Kenta Nishimoto.
Olympic silver medallist P V Sindhu celebrated her 23rd birthday with a 21-17, 21-14 win over Japan's Aya Ohori.