Men's top seed Son Wan Ho reached the quarter-finals of the Jeonju Victor Korea Masters on Thursday after cruising past China's Qiao Bin.
The South Korean was a comfortable winner against Qiao going through 21-18, 21-10 in 47 minutes he next faces countryman Ha Young Woong, who beat Indonesia's Muhammad Bayu Pangisthu 21-14, 21-18.
In other matches, South Korean fourth seed Lee Dong Keun beat Zulfadli Zulkiffli of IMalaysia 21-13, 21-8 and Indonesian eighth seed Christie Jonatan was made to work hard to get past unseeded Hashiru Shimono of Japan 19-21, 21-12, 21-19.
In a close match, South Korean sixth seed Jeon Hyeok Jin beat Japanese 10th seed Kazumasa Sakai 20-22, 21-10, 21-18 in a match lasting one hour and 16 minutes.
Japan's Kenta Nishimoto cruised past Reksy Aureza Magananda of Indonesia 21-11, 21-8 and South Korea's Heo Kwang Hee got the better of Yosei Yamaguchi 21-16, 21-16.
Second seed Lee Hyun Il of South Korea had to work hard to get past unseeded Shi Yuqi of China 21-18, 17-21, 21-9 in 65 minutes.