Yosuke (関川陽祐) Sekikawa
External sources
Loading FFA
Loading MV
FFA diagnostics
Run “Search / refresh FFA” to see each season, HTTP response, candidate and DUV comparison.
MarathonView diagnostics
Run “Refresh MV” to see login, session validation and parser status.
Cached locally. Empty refreshes never erase the last valid snapshot.
Born : 1986
Cat. M40 Ultrarunner since 2019
10
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
24
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
Japan10,8%
Rank quotient ?This runner's calculation uses 10 eligible race(s): Σ(rank − 1) = 849; Σ finishers = 7 849. 849 / 7 849 × 100 = 10.82%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed10
Km — ultra races692 km
> 100 km1
Longest race100,8 km
4th Okushinano 100 — 8/6/2024
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road14,5%
Trail85,5%
Records
HISTORY
10 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 09.05 | 50km | 12th Mt. Hiei Int. 50 km Trail Run |
8:26:15 h | 66 |
| 2025 | ||||
| 14.12 | 70km | 12th Izu Trail Journey |
10:29:51 h | 232 |
| 21.06 | 58km | 1st Kaga Spa by UTMB - Kaga Spa Trail Endurance 50 |
9:29:27 h | 100 |
| 2024 | ||||
| 08.06 | 100.8km | 4th Okushinano 100 |
13:43:04 h | 37 |
| 2023 | ||||
| 10.12 | 70km | 10th Izu Trail Journey |
8:31:12 h | 68 |
| 13.05 | 50km | 9th Mt. Hiei Int. 50 km Trail Run |
7:08:43 h | 15 |
| 2022 | ||||
| 11.12 | 70km | 9th Izu Trail Journey |
8:28:45 h | 80 |
| 2021 | ||||
| 12.12 | 69.1km | 8th Izu Trail Journey |
9:09:02 h | 178 |
| 25.09 | 54km | 8th Shigakogen Extreme Trail |
9:04:59 h | 60 |
| 2019 | ||||
| 07.10 | 100km | 1st Fuji 4 Lakes 100 km Autumn Challenge |
9:27:41 h | 23 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 8/6/2024 | 4th Okushinano 100 | 100,80 | ×4 |
| ✓ 2 | 7/10/2019 | 1st Fuji 4 Lakes 100 km Autumn Challenge | 100,00 | ×4 |
| ✓ 3 | 14/12/2025 | 12th Izu Trail Journey | 70,00 | ×2 |
| ✓ 4 | 10/12/2023 | 10th Izu Trail Journey | 70,00 | ×2 |
| ✓ 5 | 11/12/2022 | 9th Izu Trail Journey | 70,00 | ×2 |
| ✓ 6 | 12/12/2021 | 8th Izu Trail Journey | 69,10 | ×2 |
| ✓ 7 | 21/6/2025 | 1st Kaga Spa by UTMB - Kaga Spa Trail Endurance 50 | 58,00 | ×2 |
| ✓ 8 | 25/9/2021 | 8th Shigakogen Extreme Trail | 54,00 | ×2 |
| ✓ 9 | 9/5/2026 | 12th Mt. Hiei Int. 50 km Trail Run | 50,00 | ×2 |
| ✓ 10 | 13/5/2023 | 9th Mt. Hiei Int. 50 km Trail Run | 50,00 | ×2 |