LUCKNOW, Oct. 22 -- Haryana's Gurshan Mehta, seeded 12th, produced a stunning upset by defeating top seed Kshitij Sinha of Uttar Pradesh 6-4, 6-2 at the Dewan Jagat Mohan Lal Memorial AITA National Series Under-18 Tennis Tournament in Prayagraj on Wednesday, Whereas Mehta controlled the contest from the outset, breaking through against the tournament favourite in straight sets to book his place in the next round. His victory was the standout performance of Wednesday's action. Facing Sinha, the top seed and a leading home hope, the Haryana player showed composure in the crucial moments, taking the opening set 6-4 before pulling away 6-2 in the second. The result sent a clear message that the lower-seeded players remain firmly in contention for the title. Uttar Pradesh's Abhyuday Singh defeated Madhya Pradesh's Arnav Khandelwal 6-2, 6-3, while fourth seed Gyansh Manchanda of Delhi beat Dhruv Singh 6-4, 6-3. Seventh seed Lakshay Drall of Delhi was equally impressive, overcoming Telangana's Ankith D'Souza 6-3, 6-1. Sixth seed Anay Pandey of Uttar Pradesh defeated Rudransh Srivastava of Telangana 6-4, 6-3. Third seed Rishi Yadav, also from Uttar Pradesh, delivered one of the most one-sided wins of the day, beating Mohd. Aariz Khan of Madhya Pradesh 6-1, 6-1. Eighth seed Raghav Prabhu of Telangana beat Virat Singh 6-3, 6-3, and second seed Raunak Gilra of Odisha defeated Uttar Pradesh's Rishant Jaiswal 6-3, 6-3. In the girls' U-18 quarter-finals, top seed Dyuti Jain of Delhi defeated Aruja Jain of Uttar Pradesh 6-2, 6-0. Fifth seed Manusmriti Singh of Madhya Pradesh upset third seed Sharanya Srivastava 6-0, 6-2, while Aairah of Uttar Pradesh fought back from a set down to beat Anaya Sen 4-6, 7-5, 6-0. Aashi Shamshery completed the semi-final line-up with a 6-0, 6-2 win over second seed Asmi Raghuwanshi of Madhya Pradesh....