China's swimming star Sun Yang advanced as runner-up into the men's 200m freestyle final on the hunt for an additional gold medal, after winning his fourth straight world title in the men's 400m freestyle on Sunday.

Sun's time of 1:45.31 was 0.41 seconds behind the frontrunner Clyde Lewis of Australia.

"The 200m freestyle is generally a high-level competition. My result tonight was very good, and the ranking is not the most important. I believe that I can swim better tomorrow night," said Sun.

In the men's 100m backstroke, China's defending champion Xu Jiayu qualified for the final with a championship record of 52.17 seconds.

Xu was followed by Ryan Murphy of the United States in 52.44 and Evgeny Rylov of Russia in 52.44.

"I swam quite well today. I feel good especially because I broke the championship record," said Xu.

"As defending champion, I definitely want to claim the gold. Tomorrow's final must be very exciting, because all the athletes are excellent," said Xu.

Caeleb Dressel of the United States won his first gold medal in the men's 50m butterfly with a FINA record of 22.35 seconds. The U.S. swimmer claimed seven titles in Budapest two years ago.

Oleg Kostin of Russia claimed silver in 22.70, and Nicholas Santos of Brazil took bronze in 22.79.

In the women's 100m butterfly, Canadian teenager Margaret MacNeil snatched gold, preventing Sarah Sjoestroem of Sweden from winning her fourth straight world title in the event.

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