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Results

Games	Discipline (Sport) / Event	NOC / Team	Pos	Medal	As
2016 Summer Olympics	Swimming (Aquatics)	JPN			Yasuhiro Koseki
	100 metres Breaststroke, Men (Olympic)		6
	200 metres Breaststroke, Men (Olympic)		5
	4 × 100 metres Medley Relay, Men (Olympic)	Japan	5

List mentions

• Listed in Olympians Who Won a Medal at the Pan Pacific Swimming Championships (3–3–0 2014 Gold Coast gold: 100 m breaststroke and 200 m breaststroke, silver: 4×100 m medley relay; 2018 Tokyo gold: 100 m breaststroke, silver: 4×100 m medley relay and 4×100 m medley mixed relay)
• Listed in Olympians Who Won a Medal at the World Short-Course Swimming Championships (25 m) (0–0–2 2018 Hangzhou bronze: 100 m breaststroke and 4×100 m medley relay)
• Listed in Olympians Who Won a Medal at the World Aquatics Championships (0–1–0 2017 Budapest SWI silver: 200 m breaststroke)
• Listed in Olympians Who Won a Medal at the Summer Universiade (1–1–0 2013 Kazan SWI gold: 100 m breaststroke, silver: 4×100 m medley relay)
• Listed in Olympians Who Won a Medal at the Asian Games (3–5–1 2014 Incheon SWM silver: 50 m breaststroke, 100 m breaststroke, and 4×100 m medley relay, bronze: 200 m breaststroke; 2018 Jakarta/Palembang SWM gold: 50 m breaststroke, 100 m breaststroke, and 200 m breaststroke, silver: 4×100 m medley relay and 4×100 m medley mixed relay)