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| Name: | Oosawa, Seishi | 奥澤正士 |
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| Club: | 武蔵藤沢rc | ||
| Residence: | Saitama Pref. | ||
| Year of birth: | 1960 | (Cat. german: M65) | |
| Date of birth: | 00.00.0000 | (Cat. internat.: M65) | |
| Nationality: | JPN  |
Japan | |
| RunnerID: | 176232 | ||
37 search results (37 Events, 3500 km). (More)
| 2025 | 2 Events, 170 km (More) | ||||
|---|---|---|---|---|---|
| 19.10.2025 | Ultramarathon Okumusashi (JPN) | 70km | |||
| 8:33:31 h | Oosawa, Seishi | *Saitama Pref. | Overall: 189 | M: 155 | Cat M60: 14 |
| 29.06.2025 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 12:36:06 h | Oosawa, Seishi | Overall: 1395 | M: 1223 | Cat M60: 90 | |
| 2024 | 2 Events, 170 km (More) | ||||
| 20.10.2024 | Ultramarathon Okumusashi (JPN) | 70km | |||
| 8:28:28 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 245 | M: 203 | Cat M60: 17 |
| 30.06.2024 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 11:33:53 h | Oosawa, Seishi | Overall: 757 | M: 664 | Cat M60: 51 | |
| 2023 | 2 Events, 178 km (More) | ||||
| 25.06.2023 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 12:45:03 h | Oosawa, Seishi | Overall: 1569 | M: 1362 | Cat M60: 104 | |
| 04.06.2023 | Ultramarathon Okumusashi (JPN) | 78km | |||
| 9:49:57 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 386 | M: 318 | Cat M60: 17 |
| 2022 | 1 Event, 78 km (More) | ||||
| 05.06.2022 | Ultramarathon Okumusashi (JPN) | 78km | |||
| 9:31:38 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 437 | M: 362 | Cat M60: 22 |
| 2020 | 1 Event, 146 km (More) | ||||
| 24.-25.10.2020 | Autumn leaves in Okumusashi / Chichibu Journey run (JPN) | 146km | |||
| 21:46:42 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 83 | M: 77 | Cat M55: 12 |
| 2019 | 3 Events, 323 km (More) | ||||
| 02.-03.11.2019 | Autumn leaves in Okumusashi / Chichibu Journey run (JPN) | 145km | |||
| 20:49:13 h | Oosawa, Seishi | *Saitama Pref. | Overall: 44 | M: 41 | Cat M55: 6 |
| 30.06.2019 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 11:10:23 h | Oosawa, Seishi | Overall: 834 | M: 741 | Cat M55: 87 | |
| 02.06.2019 | Ultramarathon Okumusashi (JPN) | 78km | |||
| 8:58:29 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 507 | M: 436 | Cat M55: 33 |
| 2018 | 2 Events, 178 km (More) | ||||
| 24.06.2018 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 11:08:03 h | Oosawa, Seishi | Overall: 864 | M: 760 | Cat M55: 69 | |
| 03.06.2018 | Ultramarathon Okumusashi (JPN) | 78km | |||
| 9:26:06 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 476 | M: 412 | Cat M55: 29 |
| 2017 | 2 Events, 178 km (More) | ||||
| 25.06.2017 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 10:58:01 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 683 | M: 620 | Cat M55: 48 |
| 04.06.2017 | Ultramarathon Okumusashi (JPN) | 78km | |||
| 8:30:44 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 321 | M: 277 | Cat M55: 22 |
| 2016 | 3 Events, 322 km (More) | ||||
| 18.-19.09.2016 | Karisakatoge beyond Chichibu Run (JPN) | 144km | |||
| 22:35:37 h | Oosawa, Seishi | Overall: 54 | M: 49 | Cat M55: 2 | |
| 26.06.2016 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 10:28:05 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 680 | M: 608 | Cat M55: 42 |
| 05.06.2016 | Ultramarathon Okumusashi (JPN) | 78km | |||
| 8:34:52 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 392 | M: 350 | Cat M55: 20 |
| 2015 | 3 Events, 330 km (More) | ||||
| 20.-21.09.2015 | Karisakatoge beyond Chichibu Run (JPN) | 153km | |||
| 23:34:05 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 77 | M: 72 | Cat M50: 15 |
| 28.06.2015 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 10:49:41 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 808 | M: 726 | Cat M50: 120 |
| 22.06.2015 | Ultramarathon Okumusashi (JPN) | 77km | |||
| 8:38:49 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 405 | M: 361 | Cat M50: 60 |
| 2014 | 3 Events, 319 km (More) | ||||
| 14.-15.09.2014 | Karisakatoge beyond Chichibu Run (JPN) | 142km | |||
| 21:16:43 h | Oosawa, Seishi | *Saitama Pref. | Overall: 61 | M: 57 | Cat M50: 9 |
| 27.07.2014 | Ultramarathon Okumusashi (JPN) | 77km | |||
| 9:08:15 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 263 | M: 225 | Cat M50: 37 |
| 29.06.2014 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 10:22:47 h | Oosawa, Seishi | 武蔵藤沢RC | Overall: 310 | M: 273 | Cat M50: 26 |
| 2013 | 2 Events, 177 km (More) | ||||
| 28.07.2013 | Ultramarathon Okumusashi (JPN) | 77km | |||
| 8:33:33 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 318 | M: 270 | Cat M50: 37 |
| 30.06.2013 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 10:15:50 h | Oosawa, Seishi | 武蔵藤沢RC | Overall: 390 | M: 358 | Cat M50: 42 |
| 2012 | 2 Events, 177 km (More) | ||||
| 05.08.2012 | Ultramarathon Okumusashi (JPN) | 77km | |||
| 9:13:32 h | Oosawa, Seishi | *Saitama Pref. | Overall: 360 | M: 307 | Cat M50: 43 |
| 24.06.2012 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 10:51:01 h | Oosawa, Seishi | *Saitama Pref. | Overall: 654 | M: 579 | Cat M50: 78 |
| 2011 | 2 Events, 177 km (More) | ||||
| 07.08.2011 | Ultramarathon Okumusashi (JPN) | 77km | |||
| 8:52:18 h | Oosawa, Seishi | *Saitama Pref. | Overall: 332 | M: 274 | Cat M50: 32 |
| 26.06.2011 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 11:29:54 h | Oosawa, Seishi | *Saitama Pref. | Overall: 852 | M: 751 | Cat M50: 99 |
| 2010 | 2 Events, 177 km (More) | ||||
| 01.08.2010 | Ultramarathon Okumusashi (JPN) | 77km | |||
| 8:54:27 h | Oosawa, Seishi | *Saitama Pref. | Overall: 248 | M: 218 | Cat M45: 50 |
| 27.06.2010 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 11:01:20 h | Oosawa, Seishi | *Saitama Pref. | Overall: 479 | M: 428 | Cat M45: 75 |
| 2009 | 2 Events, 175 km (More) | ||||
| 02.08.2009 | Ultramarathon Okumusashi (JPN) | 75km | |||
| 7:41:35 h | Oosawa, Seishi | *Saitama Pref. | Overall: 159 | M: 140 | Cat M45: 27 |
| 28.06.2009 | Lake Saroma 100 Km Ultramarathon (JPN) | 100km | |||
| 9:52:34 h | Oosawa, Seishi | *Saitama Pref. | Overall: 360 | M: 331 | Cat M45: 56 |
| 2008 | 1 Event, 75 km (More) | ||||
| 03.08.2008 | Ultramarathon Okumusashi (JPN) | 75km | |||
| 8:04:34 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 154 | M: 134 | Cat M45: 33 |
| 2007 | 1 Event, 75 km (More) | ||||
| 05.08.2007 | Ultramarathon Okumusashi (JPN) | 75km | |||
| 8:24:57 h | Oosawa, Seishi | 武蔵藤沢rc | Overall: 167 | M: 144 | Cat M45: 27 |
| 2006 | 1 Event, 75 km (More) | ||||
| 13.08.2006 | Ultramarathon Okumusashi (JPN) | 75km | |||
| 8:07:09 h | Oosawa, Seishi | *Iruma, Saitama Pref. | Overall: 129 | M: 113 | Cat M45: 21 |
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 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 100km | 9:52:34 |
12:36:06
(5064/2171) |
11:33:53
(3392/1220) |
12:45:03
(4756/2538) |
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11:10:23
(3371/1458) |
11:08:03
(3246/1397) |
10:58:01
(2951/1214) |
10:28:05
(2299/1053) |
10:49:41
(3132/1333) |
10:22:47
(1995/579) |
10:15:50
(1976/586) |
10:51:01
(2703/737) |
11:29:54
(3466/977) |
11:01:20
(2625/616) |
9:52:34
(1437/428) |
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Comparison table
Comparison of performances in races with multiple participations
| 2025 | 2024 | 2023 | 2022 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ultramarathon Okumusashi | 18 | 8:33:31 | 8:28:28 | 9:49:57 | 9:31:38 | 8:58:29 | 9:26:06 | 8:30:44 | 8:34:52 | 8:38:49 | 9:08:15 | 8:33:33 | 9:13:32 | 8:52:18 | 8:54:27 | 7:41:35 | 8:04:34 | 8:24:57 | 8:07:09 | |
| Lake Saroma 100 Km Ultramarathon | 14 | 12:36:06 | 11:33:53 | 12:45:03 | 11:10:23 | 11:08:03 | 10:58:01 | 10:28:05 | 10:49:41 | 10:22:47 | 10:15:50 | 10:51:01 | 11:29:54 | 11:01:20 | 9:52:34 | |||||
| Karisakatoge beyond Chichibu Run | 3 | 22:35:37 | 23:34:05 | 21:16:43 | ||||||||||||||||
| Autumn leaves in Okumusashi / Chichibu Journey run | 2 | 21:46:42 | 20:49:13 |