Japanese swimmer Kosuke Hagino and Chinese teenager Shen Duo clinched their fourth gold medal of the Asian Games respectively Wednesday.
The 20-year-old Hagino clocked a winning time of four minutes 7.75 seconds in the men's 400m individual medley final, his pet event, adding to his collection of the 200m freestyle, 200m medley and 4x200m relay titles.
Hagino, who had vowed to win six gold medals in Incheon, will race in the 200m backstroke Thursday.
It were the Chinese who emerged the biggest winners in the pool as they won four of the seven events in the day - three women's individual events and the men's 4x100m freestyle relay.
Olympic champion Sun Yang swam the third leg for China as they outpaced Japan to win the 4x100m relay with an Asian record time of 3:13.47.
The Chinese quartet of Yu Hexin, Lin Yongqing, Sun Yang and Ning Zetao were in second place behind Japan during the first half of the race, but as soon as Sun took over China quickly took the lead and finished first place. Japan took the silver and hosts South Korea, with Park Tae-hwan in the line-up, had to settle for the bronze.
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Shen Duo, who grabbed six golds in last month's Youth Olympics, matched Hagino by winning the women's 200m freestyle to boost her haul of gold medals to four as well. Earlier, the 17-year-old grabbed golds in 100m freestyle, 100m breaststroke, 4x200m freestyle relay.
Her team mates Fu Yuanhui followed suit when she surged to victory in the women's 100m backstroke in 59.95 seconds, and Olympic champion Jiao Liuyang successfully retained her 200m butterfly crown in 2:07.56. Singapore also had plenty to celebrate as Joseph Schooling touched home in 51.76 seconds in the 100m butterfly to earn the state-country's first gold medal in men's swimming since 1982.