
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.
| Born |
Yasuhiro Koseki 14 March 1992 (age 33) Tsuruoka, Yamagata, Japan
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| Zodiac | Pisces |
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