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| Name: | Kengo, Koseki | 小関健吾 |
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| Club: | |||
| Residence: | Hyogo Pref. | ||
| Year of birth: | 2000 | (Cat. german: M20) | |
| Date of birth: | 00.00.0000 | (Cat. internat.: M23) | |
| Nationality: | JPN  |
Japan | |
| RunnerID: | 2076729 | ||
8 search results (8 Events, 498 km). (More)
| 2025 | 2 Events, 166 km (More) | ||||
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| 14.09.2025 | Tango 100 km Ultramarathon (JPN) | 100km | |||
| 12:46:40 h | Kengo, Koseki | Overall: 499 | M: 434 | Cat M23: 24 | |
| 20.07.2025 | Kirishima Ebino-kougen Extreme Trail (JPN) | 66km | |||
| 9:03:42 h | Kengo, Koseki | *Kumamoto Pref. | Overall: 16 | M: 14 | Cat M23: 5 |
| 2024 | 4 Events, 216 km (More) | ||||
| 21.07.2024 | Kirishima Ebino-kougen Extreme Trail (JPN) | 66km | |||
| 8:51:49 h | Kengo, Koseki | *Kumamoto Pref. | Overall: 8 | M: 7 | Cat M23: 3 |
| 06.07.2024 | Minami-aso caldera Trail Summer (JPN) | 50km | |||
| 7:00:38 h | Kengo, Koseki | Overall: 5 | M: 5 | Cat M23: 4 | |
| 26.05.2024 | Akiyoshidai Karst Trail Run (JPN) | 50km | |||
| 5:38:47 h | Kengo, Koseki | Overall: 17 | M: 16 | Cat M23: 5 | |
| 11.05.2024 | Mt. Hiei Int. 50 Km Trail Run (JPN) | 50km | |||
| 7:51:31 h | Kengo, Koseki | *Kumamoto Pref. | Overall: 27 | M: 25 | Cat M23: 10 |
| 2023 | 1 Event, 64 km (More) | ||||
| 03.09.2023 | Mizukami Mountain Party (JPN) | 64km | |||
| 11:11:48 h | Kengo, Koseki | Overall: 32 | M: 31 | Cat MU23: 1 | |
| 2022 | 1 Event, 52 km (More) | ||||
| 04.12.2022 | Kumano Old Trails (JPN) | 52km | |||
| 7:56:24 h | Kengo, Koseki | *Hyogo Pref. | Overall: 51 | M: 48 | Cat MU23: 1 |
Personal bests
Your list of personal best performances only contains performances of races which can be included into rankings.
In brackets rank in yearly international/national rankings.
| PB | 2025 | 2024 | 2023 | 2022 | |
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| 100km | 12:46:40 |
12:46:40
(5530/2459) |
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Comparison table
Comparison of performances in races with multiple participations
| 2025 | 2024 | 2023 | 2022 | ||
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| Kirishima Ebino-kougen Extreme Trail | 2 | 9:03:42 | 8:51:49 |