Chinese second seed Zhao Junpeng reached the second round of the China International Challenge in Hainan on Wednesday.
Zhao needed just 27 minutes to defeat countryman Junchen An 11-7, 11-8, 13-12 and set up a second round meeting against Haichao Liu of China after he got past Chile's Qin Zheng 13-10, 13-11, 11-9.
In some other men's first round results, China's Gu Junfeng reached the next round when his third-seeded South African opponent Jacob Maliekal was forced to retire injured after just six minutes while trailing 6-3.
Fourth seed Hashiru Shimono of Japan needed 52 minutes to defeat China's Guo Xinwa 11-5, 11-5, 9-11, 11-8; Guo Kai of China battled for 46 minutes to get past countryman Zhengze Gao 11-13, 11-1, 11-7, 5-11, 13-10 while Japan's Yusuke Onodera saw off Xin Anqi of China 11-4, 11-9, 7-11, 11-8.
Women's first round results, where no seeded players were in action on Wednesday, Zhou Meng of China needed 58 minutes to battle past Japan's Sayaka Takahashi 11-7, 6-11, 8-11, 13-11, 13-12; China's Zhiyi Wang beat countryman Chen Chen 11-8, 11-4, 11-6 and in an all-China affair Shijun Qiao got past Zhang Shuxian 8-11, 11-9, 11-9, 13-11.
Ji Shuting of China crushed Vietnam's Thu Huyen Le 11-5, 11-7, 11-6 in just 18 minutes while in another all-China matchup Cai Yanyan beat Shen Yaying 11-5, 13-11, 11-6.