Tsuyoshi (西坂剛) Nishisaka
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Born : 1980
Cat. M45 Ultrarunner since 2015
17
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
33
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?Japan
Japan4,4%
Rank quotient ?This runner's calculation uses 17 eligible race(s): Σ(rank − 1) = 498; Σ finishers = 11 445. 498 / 11 445 × 100 = 4.35%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed17
Km — ultra races1 539 km
> 100 km2
Longest race128,0 km
8th Utsukushima Fukushima Journey Run 128K — 13/9/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road81,3%
Trail18,7%
Wins & podiums (ultra)
🏆 Win2
🏆 Win M2
🏅 Top 32
🏅 Top 3 M2
Longest winning streak1
Current streak1
Records
HISTORY
17 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2025 | ||||
| 13.09 | 128km | 8th Utsukushima Fukushima Journey Run 128K |
13:28:11 h | 1 🏆 |
| 2024 | ||||
| 30.06 | 100km | 39. Lake Saroma 100 km Ultramarathon |
8:55:03 h | 97 |
| 2023 | ||||
| 15.10 | 100km | 29th River Shimanto 100km |
9:11:43 h | 49 |
| 16.09 | 123km | 6th Utsukushima Fukushima Journey Run 123K |
14:09:49 h | 1 🏆 |
| 21.05 | 100km | 11th Tokyo Shibamata 100 km |
8:35:04 h | 24 |
| 2022 | ||||
| 22.05 | 100km | 10th Tokyo Shibamata 100 km |
8:12:46 h | 19 |
| 2021 | ||||
| 09.10 | 100km | 9th Tokyo Shibamata 100 km |
9:08:48 h | 21 |
| 2019 | ||||
| 15.12 | 100km | 4th Okinawa 100km Ultramarathon |
8:45:41 h | 20 |
| 19.05 | 100km | 7th Tokyo Shibamata 100 km |
9:19:26 h | 55 |
| 2017 | ||||
| 10.09 | 50km | 10th OSJ Adatara Trail 50K |
10:34:21 h | 26 |
| 04.06 | 100km | 5th Tokyo Shibamata 100 km |
8:35:58 h | 21 |
| 29.04 | 49km | 10th Ishioka Trail Run |
4:28:03 h | 5 |
| 2016 | ||||
| 16.12 | 70km | Coast to Coast 70k Trail Run |
7:55:32 h | 35 |
| 28.08 | 70km | 3rd Tsukuba Renjyo 70 km Road & Trail Run |
7:24:06 h | 9 |
| 05.06 | 100km | 4th Tokyo Shibamata 100 km |
9:47:45 h | 100 |
| 29.04 | 49km | 9th Ishioka Trail Run |
4:56:15 h | 8 |
| 2015 | ||||
| 06.06 | 100km | 3rd Tokyo Shibamata 100 km |
8:47:08 h | 24 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 13/9/2025 | 8th Utsukushima Fukushima Journey Run 128K | 128,00 | ×3 |
| ✓ 2 | 16/9/2023 | 6th Utsukushima Fukushima Journey Run 123K | 123,00 | ×3 |
| ✓ 3 | 30/6/2024 | 39. Lake Saroma 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 4 | 15/10/2023 | 29th River Shimanto 100km | 100,00 | ×3 |
| ✓ 5 | 21/5/2023 | 11th Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 6 | 22/5/2022 | 10th Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 7 | 9/10/2021 | 9th Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 8 | 15/12/2019 | 4th Okinawa 100km Ultramarathon | 100,00 | ×3 |
| ✓ 9 | 19/5/2019 | 7th Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 10 | 4/6/2017 | 5th Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 11 | 5/6/2016 | 4th Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 12 | 6/6/2015 | 3rd Tokyo Shibamata 100 km | 100,00 | ×3 |
| ✓ 13 | 16/12/2016 | Coast to Coast 70k Trail Run | 70,00 | ×2 |
| ✓ 14 | 28/8/2016 | 3rd Tsukuba Renjyo 70 km Road & Trail Run | 70,00 | ×2 |
| ✓ 15 | 10/9/2017 | 10th OSJ Adatara Trail 50K | 50,00 | ×1 |
| ✓ 16 | 29/4/2017 | 10th Ishioka Trail Run | 49,00 | ×1 |
| ✓ 17 | 29/4/2016 | 9th Ishioka Trail Run | 49,00 | ×1 |