Top-seeded Lee Chong Wei of Malaysia and second-seeded Chen Long of China made it through to the third round of the Badminton world championships on Wednesday.
Chong Wei rallied for a 14-21, 21-18, 21-11 second-round victory over Dionysius Hayom Rumbaka of Indonesia, while Chen beat Sho Sasaki of Japan 21-15, 21-12.
Also, former top-ranked player and defending world champion Lin Dan of China beat Eric Pang of the Netherlands 21-14, 21-17.
Lin, now ranked 100th because of injuries following his second straight Olympic gold medal last year, is on course for a quarterfinal match with Chen.
In the women's section, third-seeded Saina Nehwal of India beat Olga Golovanova of Russia 21-5, 21-4, while eighth-seeded Minatsu Mitani of Japan and Thailand players Sapsiree Taerattanachai and Busanan Ongbumrungpan lost.