| Full name | Yasuhiro Koseki |
| Date of birth | March 14, 1992 (Age 24) |
| Height and weight | 1.88 m /6' 2'' — 83 kg / 183 lbs |
| Events | Swimming Men's 100m Breaststroke Swimming Men's 200m Breaststroke Swimming Men's 4 x 100m Medley Relay |
| Teams | Japan |
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