Home players have guaranteed four titles for the host nation at the Badminton World Federation (BWF) China Open in Changzhou, east China's Jiangsu Province, as all-Chinese championship matches were booked in four events following Saturday's semifinals.

In the men's singles category, China's resurgent star Shi Yuqi maintained his strong form, defeating veteran Chou Tien-chen of Chinese Taipei 21-13, 22-20. The victory sent Shi, who won last week's Japan Open, into his second consecutive final.

"After getting injured (Friday), I spent a long time on diagnosis and treatment," Shi said. "I felt some discomfort at the start of the match (Saturday), but it eased after I focused on the match."

Shi will face compatriot Wang Zhengxing in Sunday's final. The 23-year-old continued his surprise run at the high-level tournament, ousting Denmark's second-seeded Anders Antonsen 21-18, 21-15.

The women's singles semifinals featured a dramatic exit, as Olympic gold medalist An Se-young of South Korea retired injured while trailing China's Han Yue 21-19, 11-6.

Fighting back tears, An explained her decision after the match. "I felt uncomfortable from the start, and it got worse. To avoid more serious injury, I had to withdraw. I hope to recover quickly for next month's World Championships."

Han advanced to face compatriot Wang Zhiyi, who defeated two-time world champion Akane Yamaguchi of Japan 22-20, 21-11.

China's dominance extended to the doubles events.

Women's doubles pairs Liu Shengshu/Tan Ning and Jia Yifan/Zhang Shuxian won their respective semifinals, and will face off for the championship. Meanwhile, the mixed doubles final will feature China's top two seeded pairs, as Feng Yanzhe/Huang Dongping take on Jiang Zhenbang/Wei Yaxin.

In the men's doubles competition, Indonesia's Fajar Alfian/Muhammad Shohibul Fikri defeated China's Liang Weikeng/Wang Chang 21-19, 21-17 in the last four. They will meet Malaysia's Aaron Chia/Soh Wooi Yik for the title.