LUCKNOW, Nov. 6 -- Assam's seventh-seeded Kumar Shrestha Shubhi Ranjan of Uttar Pradesh won the boys and girls singles titles, respectively at the AITA Championship Series Under-12 Boys' and Girls' Tournament here on Thursday. Kumar produced the biggest upset of the event, defeating third-seeded Rudra Chaurasiya of Uttar Pradesh 6-2, 6-2 in the boys' singles final, at the Kesari Tennis Academy. Top seed Shubhi defeated third-seeded Anya 6-4, 6-3 in the final. Shrestha's title run was marked by two notable victories over higher-ranked opponents. In the semi-finals, he came from a set down to beat fifth-seeded Asvik Srivastava 4-6, 6-2, 6-1....