"It's a tough test for me to attend the tightly scheduled National Games, especially after such a short interval from the worlds. I come here to win gold medals, and at the same time, challenge myself," said Sun, who's bidding to win seven titles in Tianjin.

Another star in the pool of Tianjin 2017, Fu Yuanhui, also from Zhejiang, timed 59.40 seconds to win the women's 100m backstroke over Wang Xueer of Guangdong by just 0.85s.

Fu, who suffered a semifinal elimination in the same event in Budapest worlds before finishing a disappointing runner-up in 50m backstroke by one-hundredth of a second, told Xinhua after Saturday's final that she's wearing her "winning" swimsuit of the 2017 Kazan worlds.

"'Don't give up, no matter how bad my form seems to be,' I told my self," said the 21-year-old. "I believe there's a chance to win whenever I try."

In the following finals, newly crowned world champion Xu Jiayu came out the third Zhejiang swimmer having stepped on the top podium after winning the men's 100m backstroke in 52.60s with his provincial teammate Li Guangyuan taking the silver at nearly one second, while Jiangsu's Shi Jinglin was crowned on 1:06.71 in the women's 100m breaststroke.

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