ISLAMABAD: Promising Pakistan player Nadir Mirza caused an upset victory against compatriot and top seed Ahmed Nael Qureshi in the ITF Pakistan J30 Ali Embroidery World Junior Tennis Championship here at the PTF Tennis Complex on Wednesday. Nadir outclassed Ahmed 6-2, 6-4 to cruise into the boys’ singles quarter-finals. Pakistan’s Mohammad Talha Khan also moved into the next round when he routed Thailand’s Patham Laosakulporn 6-1, 6-4 while Hamza Roman, another home player, overcame Korea’s Youngchae OH 6-4, 6-3. Boys singles pre-quarterfinals: Sign Ji (Korea) bt Danathi Taking (Thailand) 6-3, 6-0; Mohammad Talha Khan (Pakistan) bt Patham Laosakulporn (Thailand) 6-1, 6-4; Park Dohyun (Korea) bt Bilal Asim (Pakistan) 2-6, 6-3, 6-2; Teetawat (Thailand) bt Salar Khan (Pakistan) 6-4, 6-4; Nadir Mirza (Pakistan) bt Ahmed Nael Qureshi (Pakistan) 6-2, 6-4; Ariyaphol Leekul (Thailand) Hiuyuan Guo (China) 6-1, 6-0; Seung Woo Han (Korea) bt Ahtesham Humayun (Pakistan) 6-3, 6-3; Yeon joo Cha (KOR)/So Yuna (Korea) bt Paulina huretskaya/Karolina ligai (Kazakhstan) 6-0, 6-1; Hamza Roman (Pakistan) bt Youngchae OH (Korea) 6-4, 6-3 Boys doubles (first round): Asim Bilal/Ahmed Nael Qureshi bt Dohyun Park/Amir Mazari 7-5, 7-5; Ji sion Jung/Yeonmu bt Mohammad Huzaifa/Mohammad Talha 7-5, 6-4; Guo Xiuyuan/Park Hho Jun bt Nadir Mirza /Nishikori Yota 4-6, 6-2 [10-6]. Girls doubles (fist round): Katsube Haruhi (Japan)/ Hinata Wada (Japan) bt Fatima Ali Raja/Zainab Ali Raja 6-0, 6-0; Jo A Hyun (Korea)/Lee Chaerin (Korea) bt Hong Jin A/Yan Jingke (Korea) 6-1, 6-2; Cha Yeon Joo/Yuna So (Korea) bt Soha Ali/Sheeza Sajid (Pakistan) 6-2, 6-0; Kim Hayoon/Moon Chaewon (Korea) bt Kantam Tanisha (Singapore)/Kense Leyla (Germany) 6-4, 6-2.