Yasuhiro Koseki

Yasuhiro Koseki

Personal information
Full name	Yasuhiro Koseki
National team	Japan
Born	(1992-03-14) March 14, 1992 Tsuruoka, Yamagata, Japan
Height	1.86 m (6 ft 1 in)
Weight	82 kg (181 lb)
Sport
Sport	Swimming
Strokes	Breaststroke
Club	Miki House
Medal record Men's swimming Representing Japan World Championships 2017 Budapest 200 m breaststroke World Championships (SC) 2018 Hangzhou 100 m breaststroke 2018 Hangzhou 4×100 m medley Pan Pacific Championships 2014 Gold Coast 100 m breaststroke 2014 Gold Coast 200 m breaststroke 2018 Tokyo 100 m breaststroke 2014 Gold Coast 4×100 m medley 2018 Tokyo 4×100 m medley 2018 Tokyo 4×100 m mixed medley Asian Games 2018 Jakarta 50 m breaststroke 2018 Jakarta 100 m breaststroke 2018 Jakarta 200 m breaststroke 2014 Incheon 50 m breaststroke 2014 Incheon 100 m breaststroke 2014 Incheon 4×100 m medley 2018 Jakarta 4×100 m medley 2018 Jakarta 4×100 m mixed medley 2014 Incheon 200 m breaststroke Universiade 2013 Kazan 100 m breaststroke 2013 Kazan 4×100 m medley East Asian Games 2013 Tianjin 100 m breaststroke 2013 Tianjin 4×100 m medley

Yasuhiro Koseki (小関也朱篤, Koseki Yasuhiro, born March 14, 1992) is a Japanese competitive swimmer and breaststroke specialist. He won the 100-meter event at the 2013 Summer Universiade, 2013 East Asian Games, and the 2014 Pan Pacific Swimming Championships. He hold the Asian record in this event, set in February 2014.

Since 2010 Koseki studied at the Nippon Sport Science University, where he first specialized in the freestyle, and only later changed to breaststroke, motivated by Kosuke Kitajima.