| Name: | Iwahara, Masatomo | 岩原正知 |
|
| Club: | |||
| Residence: | Tokyo | ||
| Year of birth: | 1980 | (Cat. german: M45) | |
| Date of birth: | 29.12.1980 | (Cat. internat.: M45) | |
| Nationality: | JPN ![]() |
Japan | |
| RunnerID: | 365352 | ||
20 search results (20 Events, 1773.85 km). (More)
| 2025 | 3 Events, 241 km (More) | ||||
|---|---|---|---|---|---|
| 19.10.2025 | Ultramarathon Okumusashi (JPN) | 70km | |||
| 5:42:01 h | Iwahara, Masatomo | *Tokyo | Overall: 4 | M: 4 | Cat M40: 2 |
| 18.05.2025 | Yatsugatake Nobeyama 100 km (JPN) | 100km | |||
| 9:29:45 h | Iwahara, Masatomo | Overall: 19 | M: 18 | Cat M40: 3 | |
| 12.04.2025 | Toda Saiko 70 km (JPN) | 71km | |||
| 5:02:49 h | Iwahara, Masatomo | *Tokyo | Overall: 2 | M: 2 | Cat M40: 1 |
| 2024 | 1 Event, 62 km (More) | ||||
| 21.04.2024 | Fuji 3 Lakes 62 km Challenge (JPN) | 62km | |||
| 4:47:00 h | Iwahara, Masatomo | *Tokyo | Overall: 8 | M: 8 | Cat M40: 2 |
| 2023 | 3 Events, 215 km (More) | ||||
| 27.08.2023 | Ainan Maranic - Food Sea and Sun (JPN) | 53km | |||
| 4:35:35 h | Iwahara, Masatomo | Overall: 1 | M: 1 | Cat M40: 1 | |
| 21.05.2023 | Tokyo Shibamata 100 km (JPN) | 100km | |||
| 9:23:53 h | Iwahara, Masatomo | Overall: 55 | M: 51 | Cat M40: 12 | |
| 16.04.2023 | Fuji 3 Lakes 62 km Challenge (JPN) | 62km | |||
| 4:50:03 h | Iwahara, Masatomo | *Tokyo | Overall: 6 | M: 6 | Cat M40: 2 |
| 2022 | 2 Events, 200 km (More) | ||||
| 22.05.2022 | Tokyo Shibamata 100 km (JPN) | 100km | |||
| 9:26:42 h | Iwahara, Masatomo | Overall: 55 | M: 47 | Cat M40: 11 | |
| 13.03.2022 | Ibaraki 100k Ultra Marathon (JPN) | 100km | |||
| 8:06:48 h | Iwahara, Masatomo | Overall: 9 | M: 9 | Cat M40: 3 | |
| 2021 | 2 Events, 270 km (More) | ||||
| 09.10.2021 | Tokyo Shibamata 100 km (JPN) | 100km | |||
| 8:31:42 h | Iwahara, Masatomo | Overall: 12 | M: 9 | Cat M40: 1 | |
| 17.-18.07.2021 | Japan Trophy 24h (JPN) | 24h | |||
| 170.000 km | Iwahara, Masatomo | Overall: 31 | M: 23 | Cat M40: 7 | |
| 2018 | 1 Event, 100 km (More) | ||||
| 03.06.2018 | Tokyo Shibamata 100 km (JPN) | 100km | |||
| 10:36:55 h | Iwahara, Masatomo | Overall: 169 | M: 152 | Cat M35: 21 | |
| 2016 | 1 Event, 100 km (More) | ||||
| 05.06.2016 | Tokyo Shibamata 100 km (JPN) | 100km | |||
| 10:22:50 h | Iwahara, Masatomo | Overall: 162 | M: 154 | Cat M35: 31 | |
| 2015 | 2 Events, 162.4 km (More) | ||||
| 12.09.2015 | Green Charity Marathon Tokyo - Standard Run 6H (JPN) | 6h | |||
| 62.400 km | Iwahara, Masatomo | Overall: 5 | M: 5 | Cat M23: 2 | |
| 19.04.2015 | Fuji 5 Lakes 100 km Challenge (JPN) | 100km | |||
| 9:25:18 h | Iwahara, Masatomo | Overall: 50 | M: 48 | Cat M23: 15 | |
| 2014 | 3 Events, 223.45 km (More) | ||||
| 21.-22.06.2014 | Tokyo Challenge 12 hours (JPN) | 12h | |||
| 51.450 km | Iwahara, Masatomo | Overall: 34 | M: 25 | Cat M23: 7 | |
| 01.06.2014 | Tokyo Shibamata 100 km (JPN) | 100km | |||
| 8:58:06 h | Iwahara, Masatomo | Overall: 9 | M: 9 | Cat M23: 3 | |
| 20.04.2014 | Fuji 5 Lakes 72 km Challenge (JPN) | 72km | |||
| 5:50:30 h | Iwahara, Masatomo | *Tokyo | Overall: 7 | M: 7 | Cat M23: 5 |
| 2013 | 1 Event, 100 km (More) | ||||
| 01.06.2013 | Tokyo Shibamata 100 km (JPN) | 100km | |||
| 8:38:30 h | Iwahara, Masatomo | *Tokyo | Overall: 11 | M: 8 | Cat M23: 3 |
| 2012 | 1 Event, 100 km (More) | ||||
| 21.10.2012 | River Shimanto 100km (JPN) | 100km | |||
| 8:58:07 h | Iwahara, Masatomo | *Tokyo | Overall: 39 | M: 37 | Cat M23: 9 |
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 | 2021 | 2018 | 2016 | 2015 | 2014 | 2013 | 2012 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 100km | 8:31:42 |
|
|
9:23:53
(795/281) |
9:26:42
(716/90) |
8:31:42
(229/9) |
10:36:55
(2474/1007) |
10:22:50
(2165/986) |
|
8:58:06
(635/155) |
8:38:30
(418/95) |
8:58:07
(660/161) |
Comparison table
Comparison of performances in races with multiple participations
| 2025 | 2024 | 2023 | 2022 | 2021 | 2018 | 2016 | 2015 | 2014 | 2013 | 2012 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tokyo Shibamata 100 km | 7 | 9:23:53 | 9:26:42 | 8:31:42 | 10:36:55 | 10:22:50 | 8:58:06 | 8:38:30 | ||||
| Fuji 5 Lakes 72 km Challenge | 3 | 4:47:00 | 4:50:03 | 5:50:30 |





