Zhang Yufei of China competes during the Women's 100m Butterfly Final of Swimming at the 19th Asian Games in Hangzhou, east China's Zhejiang province, Sept 27, 2023. (PHOTO / XINHUA)

JINAN, China - Olympic champion Zhang Yufei won the women's 100m butterfly in 56.85 seconds at the 2023 Chinese National Swimming Championships on Sunday.

Multiple world champion Qin Haiyang lived up to expectations by winning the men's 100m breaststroke in 58.40 seconds, while Wang Shun finished fourth.

Yu Yiting won the women's 200m individual medley in 2:10:69. "I think there are still much left to be improved in the future," Yu said.

Chinese swimmer Qin Haiyang competes in the men's 200m breaststroke final at the 19th Asian Games in Hangzhou, east China's Zhejiang province on Sept 28, 2023. (PHOTO / XINHUA)

Zhang Zhanshuo, a teenager from Shandong, captured the men's 400m freestyle title.

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A total of 537 swimmers from 28 teams are taking part in the national championships which will run through Friday.