Sarah, seeded 5/8, rallied to a hard-earned 3-11, 12-10, 12-10, 11-9 win over Diksha, seeded 3/4, to enter the girls under-15 semi-finals.
Yadav, also seeded 5/8, won a gripping contest when he stunned Prabhu, ranked 3/4, 8-11, 11-13, 13-11, 11-9, 11-9 in a well-contested match to advance to the boys under-17 semi-finals.
In women's quarter finals, Urwashi Joshi, Aparajita Balamurukan and Sachika Balvani scored straight-game victories while Amruta Swami got a walk-over.
Women: Urwashi Joshi bt Sanika Choudhari 11-4, 11-6, 11-4; Amruta Swami w/o Shaheen Madraswala; Aparajitha Balamurukan bt Riya Sisodia 11-3, 11-4, 11-4; Sachika Balvani bt Shailly Padiya 11-6, 11-3, 11-0.
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Boys U-11: Ekambir Singh bt Kavya Anand 11-2, 11-4, 11-7; Siddharth Bhandari bt Vedant Chheda 11-7, 11-4, 11-8; Dev Sharma bt Anshuman Jaising 11-8, 11-8, 11-9; Aakash Kannan bt Priyaan Thakker 12-10, 11-8, 11-9.
Girls U-11: Diya Yadav bt Karina Phipps 11-3, 11-3, 11-3; Unnati Tripathi bt Ipsa Mishra 11-4, 11-5, 12-10; Jiya Chotrani bt Yashi Jain 11-3, 11-4, 11-7; Anahat Singh bt Akanksha Gupta 11-2, 11-7, 11-3.
Girls U-13: Aasya Patel bt Aleya Masand 11-4, 11-2, 11-3; Nayna Taneja bt Ananthi Vivek 11-5, 11-3, 11-2; Pooja Arthi R. bt Tiana Parasrampuria 11-6, 11-7, 11-7; Kaavya Bansal bt Advita Sharma 11-8, 10-12, 11-6, 13-11.
Boys U-15: Tanay Punjabi bt Arman Darukhanawalla 11-8, 9-11, 11-2, 11-6; Shreyas Mehta bt Paarth Ambani 11-3, 11-4, 11-6; Arnaav Sareen bt Mohit Bhatt 11-7, 11-9, 9-11, 11-7; Jay Vaknalli bt Aakash Gupta 11-9, 12-14, 11-7, 11-8.
Boys U-17: Prithvi Singh bt Deepak Mandal 11-7, 11-5, 9-11, 11-6; Suraj Chand bt Jairaj Singh 13-11, 11-4, 11-9; Avinash Yadav bt Navaneeth Prabhu S. 8-11, 11-13, 13-11, 11-9, 11-9; Advait Adik bt Vedant Ambani 11-4, 11-6, 11-5.