Tomoyuki (岩崎智之) Iwasaki
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Born : 1986
Cat. M40 Ultrarunner since 2022
9
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
34
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
Japan34,6%
Rank quotient ?This runner's calculation uses 9 eligible race(s): Σ(rank − 1) = 463; Σ finishers = 1 338. 463 / 1 338 × 100 = 34.60%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed9
Km — ultra races1 395 km
> 100 km8
> 160 km7
> 200 km2
> 24h2
> 48h2
Longest race228,0 km
6th Last Samurai Standing Backyard Ultra - Tokyo — 22/11/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road11,5%
Trail57,7%
Elim.30,8%
Wins & podiums (ultra)
🏆 Win0
🏆 Win M0
🏅 Top 31
🏅 Top 3 M1
Longest winning streak0
Current streak0
HISTORY
9 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2025 | ||||
| 22.11 | Backyard Ultra | 6th Last Samurai Standing Backyard Ultra - Tokyo |
228.004 km (34h) | 12 |
| 29.03 | 100mi | 1st Biwako 24 - 100miles |
23:33:17 h | 2 🥈 |
| 2024 | ||||
| 01.11 | Backyard Ultra | 5th Last Samurai Standing Backyard Ultra - Tokyo |
201.180 km (30h) | 9 |
| 12.10 | 100mi | 10th OSJ Koumi 100 |
30:45:13 h | 37 |
| 20.04 | 100mi | 2nd Nishikan 3 Peaks Ultra Challenge |
32:30:36 h | 7 |
| 2023 | ||||
| 16.09 | 162.6km | 15th Shinetsu Five Mountains Trail 100 mile |
31:00:21 h | 123 |
| 2022 | ||||
| 08.10 | 100mi | 8th OSJ Koumi 100 |
34:10:51 h | 53 |
| 11.06 | 100.8km | 2nd Okushinano 100 |
16:06:03 h | 138 |
| 28.05 | 59km | 14th OSJ Okukuji Trail 60k |
11:40:31 h | 91 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 22/11/2025 | 6th Last Samurai Standing Backyard Ultra - Tokyo | 228,00 | ×6 |
| ✓ 2 | 1/11/2024 | 5th Last Samurai Standing Backyard Ultra - Tokyo | 201,18 | ×5 |
| ✓ 3 | 16/9/2023 | 15th Shinetsu Five Mountains Trail 100 mile | 162,60 | ×4 |
| ✓ 4 | 29/3/2025 | 1st Biwako 24 - 100miles | 160,93 | ×4 |
| ✓ 5 | 12/10/2024 | 10th OSJ Koumi 100 | 160,93 | ×4 |
| ✓ 6 | 20/4/2024 | 2nd Nishikan 3 Peaks Ultra Challenge | 160,93 | ×4 |
| ✓ 7 | 8/10/2022 | 8th OSJ Koumi 100 | 160,93 | ×4 |
| ✓ 8 | 11/6/2022 | 2nd Okushinano 100 | 100,80 | ×2 |
| ✓ 9 | 28/5/2022 | 14th OSJ Okukuji Trail 60k | 59,00 | ×1 |