Kosuke Hagino

Kosuke Hagino (萩野公介, Hagino Kōsuke; born 15 August 1994) is a Japanese former competitive swimmer who specialized 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 400 m individual medley (long course), the 100 m and 200 m individual medley (short course). With Team Japan, he holds the Asian Record for the 4 × 100 m freestyle relay (short course).

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.

He married the singer Miwa in 2019 fall and the couple has been expecting a child; its birth expected some time in 2019 winter. They divorced in March 2024.

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.

Coming into the Championships Hagino had qualified for a full slate of events including the 200 m freestyle, 400 m freestyle, 100 m backstroke, 200 m backstroke, 200 m individual medley and the 400 m individual medley. In his first event the 400 m freestyle Hagino won his first silver medal at the World Championships medal with a new Japanese record of 3:44.82.

In the Finals of 200 m Freestyle, Hagino clocked a personal best time of 1:45.94.; he came in 5th.