LUCKNOW, Sept. 10 -- Upsets continued to hog the limelight even in the quarterfinals of the AITA Championship Series for Under-12 and Under-14 boys and girls on Wednesday, at the Vijayant Khand Stadium here. In the under-14 boys' quarterfinals, Ayush Deuskr of Maharashtra set the tone with a commanding performance, defeating Mohd Hamdaan 6-0, 6-2 to advance convincingly. Home talent Arnav Srivastava edged past fellow Uttar Pradesh player Arav Shukla 7-5, 6-3 in a tight encounter. The day's biggest shock came when eighth seed Krishna Singh dismantled third seed Pavith Singh 6-0, 6-0 a true upset that reshuffled expectations heading into the semis. Top seed Tejas Singh (UP) remained composed, beating Pranay Shukla 6-1, 6-2 to maintain his title charge. Under-12 boys' action delivered drama and endurance. Seventh seed Asvik Srivastava produced a flawless display to blank Avighna Verma 6-0, 6-0, while top seed Ankur Alok matched the scoreline against sixth seed Rudra Chaurasiya. The quarterfinal shocker came in a marathon three-setter: Aarav Verma fought back from a set down to overcome Mohd Hamdaan, the second seed, 4-6, 6-4, 14-12 a resilient upset that earned loud applause. Fifth seed Arnav Srivastava also advanced, beating Pranay Shukla 6-4, 7-5 in a competitive match. Girls' draws saw seeds fall and favorites dominate. In the under-14 semis, fourth seed Siddhi Singh produced the tournament's headline upset, defeating top seed Anaya Sen 7-5, 6-1 with fierce baseline play and tactical maturity. Second seed Saundarya Jaiswal cruised into the final with a 6-0, 6-0 win over Anya, setting up an intriguing title clash. Under-12 girls' quarterfinals combined tight battles and decisive scores. Third seed Anya upset Maharashtra's Vaani Chuttur 4-6, 6-0, 10-4 in a comeback tiebreak victory. Fourth seed Siya Singh and second seed Anvesha Singh won comfortably against Siya 6-0, 6-0 over Anya Chaudhary and Anvesha 6-4, 6-4 over Hiya Chauhan. Top seed Shubhi Ranjan advanced after a tense 6-2, 7-6 (3) victory against Samaira Tamhane Maharshtra....