Ojasvinee struggled for two hours and and 42 minutes in a marathon battle to carve a 6-3 4-6 7-5 win over Karman Kaur Thandi the other Indian in the semis.
Ojasvinee will face American Raveena Kingsley who breezed past eight seeded Zhanlan Wei from China with a straight 7-5 6-1 victory.
In the boys singles, fifth seeded Sameer outclassed the young seventh seed from France, Geoffrey Blancaneaux, in a close 6-3 7-5 which lasted for one hour and 45 minutes.
Sameer will seek to win a second title as he won the boys' doubles with Isa MammetGulyyev of Turkmenistan downing top seeded pair Wei De Lin and Cing Yang Meng of Chinese Taipei 3-6 6-4 (10-5).
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The pair of Indonesia and Chinese Taipei, Rifanty Kahfiani and Fang Hsien Wu respectively lifted the girls double crown defeating the India duo of Vasanti Shinde and Ojasvinee 6-3 7-5.
Results (SFs)
Boys singles: Mandresy Rakotomalala (FRA) bt Clement Larriere (FRA)(4) 6-3, 6-3; Sameer Kumar (USA)(5) bt Geoffrey Blancaneaux (FRA)(7) 6-3, 7-5.