Kosei Shiraishi
JapanActive- Born
- Jun 23, 2002 (24 years old)
- Events
- Marathon · 10 000 m
Kosei Shiraishi is a Japan middle-distance runner, born on June 23, 2002. He competes primarily in the 1500m, 5000m and 10000m.
His personal bests include 3:49.04 in the 1500m, 13:35.53 in the 5000m, 28:23.99 in the 10000m, 1:03:05 in the Semi and 2:08:42 in the Marathon. He is currently active on the international athletics circuit, representing Japan.
Personal best · Marathon2:08:42
2026 season best2:15:00Aug 30, 2026 · Osaka
Personal best · 10 000 m28:23.99
Last competitionTCS Sydney Marathon Presented by ASICSAug 30, 2026 · 2:15:00
As of Nov 13, 2026: Marathon 2:08:42 (#996 all-time), 10 000 m 28:23.99, 2026 season best 2:15:00 (Aug 30, 2026, Osaka (JPN)) · Last competition: TCS Sydney Marathon Presented by ASICS, Aug 30, 2026, 2:15:00 · 24 years old
Personal bests
WA points calculator →DisciplineResultAll-time2026
5KilometreTokyo 202314:58––
Progression
| Season | Discipline | Result | Wind | Date | Competitions |
|---|---|---|---|---|---|
| 2026 | 5000m | 14:00.67 | – | Jun 12, 2026 | Japanese Championships |
| 2026 | Marathon | 2:15:00 | – | Aug 30, 2026 | TCS Sydney Marathon Presented by ASICS |
| 2025 | 1500m | 3:49.04 | – | Jun 8, 2025 | 69th Kansai Inter-Corporate Track & Field Championships |
| 2025 | 5000m | 13:35.53 | – | Jul 12, 2025 | HOKUREN Distance Challenge 2025 in Chitose, Aoba Park Athletic Field, Chitose |
| 2025 | 10000m | 28:55.90 | – | Jul 19, 2025 | HOKUREN Distance Challenge 2025 in ABASHIRI, Athletic Track, Abashiri |
| 2025 | Marathon | 2:08:42 | – | Feb 2, 2025 | 73rd Beppu-Oita Mainichi Marathon, Oita |
| 2024 | 5000m | 14:28.5h | – | Jun 15, 2024 | All Japan University Track & Field Challenge, Lemon Gas Stadium, Hiratsuka |
| 2024 | 10000m | 28:23.99 | – | May 9, 2024 | The 103th Kanto Inter-University Track＆Field Championships, National Stadium, Tokyo |