Masashi (尾崎将司) Ozaki
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 : 1975
Cat. M50 Ultrarunner since 2010
9
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
25
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
Japan7,3%
Rank quotient ?This runner's calculation uses 9 eligible race(s): Σ(rank − 1) = 384; Σ finishers = 5 237. 384 / 5 237 × 100 = 7.33%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed9
Km — ultra races818 km
Longest race100,0 km
31th River Shimanto 100km — 19/10/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road100,0%
Wins & podiums (ultra)
🏆 Win0
🏆 Win M0
🏅 Top 31
🏅 Top 3 M1
Longest winning streak0
Current streak0
Records
HISTORY
9 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2025 | ||||
| 19.10 | 100km | 31th River Shimanto 100km |
10:33:45 h | 160 |
| 28.09 | 64km | 28th Muraoka 64 km Ultra Marathon |
5:27:58 h | 34 |
| 2023 | ||||
| 15.10 | 100km | 29th River Shimanto 100km |
9:44:43 h | 100 |
| 2013 | ||||
| 29.09 | 66km | 16th Muraoka 66 km Ultra Marathon |
6:51:11 h | 20 |
| 2012 | ||||
| 21.10 | 100km | 18th River Shimanto 100km |
8:43:56 h | 30 |
| 30.09 | 100km | 15th Muraoka 100 km Ultra Marathon |
9:47:34 h | 14 |
| 16.09 | 88km | 3rd Akiota Yajirushi Marathon 88km |
7:52:47 h | 11 |
| 2011 | ||||
| 25.09 | 100km | 14th Muraoka 100 km Ultra Marathon |
8:49:45 h | 3 🥉 |
| 2010 | ||||
| 20.06 | 100km | 5. Okinoshima 100km Ultra Marathon |
10:20:20 h | 21 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 19/10/2025 | 31th River Shimanto 100km | 100,00 | ×4 |
| ✓ 2 | 15/10/2023 | 29th River Shimanto 100km | 100,00 | ×4 |
| ✓ 3 | 21/10/2012 | 18th River Shimanto 100km | 100,00 | ×4 |
| ✓ 4 | 30/9/2012 | 15th Muraoka 100 km Ultra Marathon | 100,00 | ×4 |
| ✓ 5 | 25/9/2011 | 14th Muraoka 100 km Ultra Marathon | 100,00 | ×4 |
| ✓ 6 | 20/6/2010 | 5. Okinoshima 100km Ultra Marathon | 100,00 | ×4 |
| ✓ 7 | 16/9/2012 | 3rd Akiota Yajirushi Marathon 88km | 88,00 | ×3 |
| ✓ 8 | 29/9/2013 | 16th Muraoka 66 km Ultra Marathon | 66,00 | ×2 |
| ✓ 9 | 28/9/2025 | 28th Muraoka 64 km Ultra Marathon | 64,00 | ×2 |