The MP boy, seeded 16th, ousted sixth seed Indra Patwardhan of Maharashtra, who is nationally ranked 11, in three sets to move into a semi final clash against Delhi's No.4 seed Alex Solanki tomorrow.
Jaisinghani, nationally ranked 24, had knocked out top seed B R Nikshep in three sets yesterday in the third round.
The other semifinal pits No.3 Paramveer Singh Bajwa of Punjab against No.7 Gokul Suresh of Tamil Nadu.
In the corresponding girls singles, top seed Akshara Iska of AP, No.3 Karman Kaur of Delhi, No.4 Himani Mor of Haryana and No.13 Nandini Sharma of Chandigarh entered the last four.
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Results (all quarter finals):
Boys under 16 singles: Raghav Jaisinghani (MP) bt Indra Patwardhan (MH) 4-6, 6-3, 6-4; Alex Solanki (DL) bt Udayan Bhakar (RJ) 6-3, 6-2; Paramveer Singh Bajwa (PB) bt bt Vinod Vashisht (KA) 6-3, 2-0 (retd); Gokul Suresh (TN) bt Dhruv Pal (UA) 4-6, 6-1, 6-0.