Japan 's Daiya Seto proved the class act of the men 's 200m butterfly .
Ryosuke Irie roared to gold in the men 's 100m backstroke , while China 's women also won three golds at the Munhak Park Tae - hwan Aquatics Center .
Japan 's Daiya Seto proved the class act of the men 's 200m butterfly and Ryosuke Irie roared to gold in the men 's 100m backstroke , while China 's women also won three golds at the Munhak Park Tae - hwan Aquatics Center .