Qin Haiyang of China set a world record of 2 minutes, 5.48 seconds in the men's 200-meter breaststroke at the world aquatics championships in Japan on Friday.The 24-year-old became the first swimmer to complete a breaststroke treble at the world championships after winning the 50 and 100 meters earlier at Marine Messe Fukuoka.Australia's Zac Stubblety-Cook finished second in 2:06.40. American Matt Fallon was third in 2:07.74, while Japan's Ippei Watanabe came sixth in 2:08.78.Related coverage:Swimming: Mollie O'Callaghan sets women's 200 freestyle world recordREAD FULL ARTICLE