Sun Yang of China left no chance for fellow swimmers in men's 1500m freestyle while sprinter Ning Zetao helped China to claim the title of men's 4x100m medley relay with a result as best as the current world record on Friday night at Munhak Park Tae-hwan Aquatic Center.

Sun took the lead from the first 50 meters mark till the end, expanding his advantages to 5.11 second to secure a gold with a result of 14 minutes 49.75 seconds.

"I hadn't been worrying too much about the race. I know I'm stronger in this event. It was good to have teammate Wang Kecheng racing with me and I'm happy to see two national flags being raised up," Sun said.

South Korea press had dubbed the swimming competition as a clash between Park and Sun and the 1500m race was the last stage for the clash.

However, a birthday cake brought by Sun to Park to celebrate his birthday, which falls on Saturday, put an end to any speculation that the two are hostile to each other.

In a hotly contested race in men's 4x100m medley relay, Ning clocked 46.91 seconds in the last leg of the relay, helping the Chinese team to come from behind and win the gold medal.

Asian record holder Ryosuke Irie brought the Japanese team a good start. His 100m backstroke was 0.73 seconds faster than rival Xu Jiayu of China. In the following two legs of breaststroke and butterfly, the Japanese managed to lead as well.

Ning, the 100m freestyle winner, changed a deficit of 0.86 seconds into a victory by 0.33 seconds. The Chinese team won by setting a new Asian Games record of three minutes 31.37 seconds.

"I was very excited because the Chinese team had never won in 4x100m medley relay before. Today, we made history. I'm very happy," Ning said.

The 21-year-old said he was very clear that the last leg would be the most important one in a relay race.

"I knew I had to be perfect in every detail. The team empowered me to stage a performance above my level," he said.

Olympic champion Ye Shiwen continued to rule in individual medley. She took the title in women's 200m individual medley with two minutes 8.94 seconds.

"Generally, I'm quite happy with the result although the result was not up to my personal best," Ye said.

Chen Xinyi of China bagged the women's 50m freestyle with a result of 24.86 seconds.

Kazakhstan's Dmitriy Balandin won the gold in men's 50m breaststroke at 27.78 seconds. He swept breaststroke events, taking all three titles in 50m, 100m and 200m events.

Japan's Sayaka Akase claimed victory in the women's 200m backstroke by two minutes 10.31 seconds.

China leads in Friday's medal chase by four gold, while Japan and Kazakhstan taking one more gold. The swimming medal tally stands as China taking 22 golds, well ahead of Japan's 12 golds, Kazakhstan's three and Singapore's one.