Malaysia's top seed Goh Jin Wei was knocked out of the girls' singles tournament as the Badminton World Federation (BWF) World Junior Championships continued at the Bilbao Arena in Spain today.
The defending champion was defeated in three games by Japan's unseeded player Natsuki Oie, who now duly takes her place in the quarter-finals.
Oie recovered from going behind to win 10-21, 21-16, 21-16.
She is now due to play China's Gao Fangjie after she came through against Poland's Gregoria Mariska Tunjung, 21-18, 21-14.
China's second seed Chen Yufei may now be favourite for the title after she eased through against Indian Shikha Gautam, 21-13, 21-10.
Third seed Pornpawee Chochuwong, of Thailand, also remains in contention, however, thanks to a 21-10, 21-11 success over Léonice Huet of France.
In the men's competition, Thailand's top seed Kantaphon Wangcharoen made the last eight as he saw off Ramadhani Zulkifli of Indonesia 21-13, 21-14.
Malaysia's second seed Lee Zii Jia is also through thanks to a 21-14, 21-13 triumph against Canada's Jason Anthony Ho-shue.
China's fifth seed Sun Feixiang needed three games to reach the next round but he eventually came good against India's Lakshya Sen, 21-17, 8-21, 21-13.
He will play Japan's Koki Watanabe, a 21-17, 17-21, 21-19 winner over Lee Chia-hao of Chinese Taipei.