Kosuke Hagino
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Kosuke Hagino (萩野公介, Hagino Kōsuke, born 15 August 1994) is a Japanese competitive swimmer who specializes in the individual medley and 200 m freestyle. He is a four-time Olympic medalist, most notably winning gold in the 400 m individual medley at the 2016 Summer Olympics.

Hagino holds the Asian Records in the 200 m and 400 m individual medley (long course), the 100 m and 200 m individual medley (short course). With Team Japan, he holds the Asian Records for the 4×100 m freestyle relay and the 4×100 m medley relay.

Hagino attends Toyo University, and is coached by Norimasa Hirai. He is one of the only two Asians to have been voted World Swimmer of the Year.

Kosuke Hagino was born in Tochigi, Tochigi, Japan on 15 August 1994.

Hagino made his international breakthrough at the 2012 Olympics held in London. He qualified First in the 400 m individual medley heats with a new Asian record of 4:10.01, and would go on to win his first international medal with a bronze in the event and again lower his Asian record to a 4:08.94.