Hiroyuki (佐々木裕之) Sasaki
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Born : 1977
Cat. M45 Ultrarunner since 2004
14
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
31
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
Japan12,9%
Rank quotient ?This runner's calculation uses 14 eligible race(s): Σ(rank − 1) = 894; Σ finishers = 6 951. 894 / 6 951 × 100 = 12.86%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed14
Km — ultra races1 098 km
Longest race100,0 km
17th 100 km Ultra Maranic Osaka — 19/4/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road63,4%
Trail36,6%
Wins & podiums (ultra)
🏆 Win1
🏆 Win M1
🏅 Top 31
🏅 Top 3 M1
Longest winning streak1
Current streak0
Records
HISTORY
14 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 19.04 | 100km | 17th 100 km Ultra Maranic Osaka |
12:11:55 h | 98 |
| 2025 | ||||
| 20.04 | 100km | 16th 100 km Ultra Maranic Osaka |
11:36:01 h | 67 |
| 2024 | ||||
| 21.04 | 70km | 15th 70 km Ultra Maranic Osaka |
8:33:47 h | 104 |
| 2023 | ||||
| 23.04 | 100km | 14th 100 km Ultra Maranic Osaka |
12:20:39 h | 140 |
| 2022 | ||||
| 17.04 | 70km | 13th 70 km Ultra Maranic Osaka |
8:34:33 h | 45 |
| 2020 | ||||
| 18.10 | 56km | 23th Mt. Rocco Cannonball Run - 56 km Speed |
9:43:00 h | 299 |
| 2014 | ||||
| 19.10 | 73km | 5th OSJ Hyonosen Mountains Trail Race |
8:22:28 h | 5 |
| 20.07 | 65km | 5th Nozawa Onsen 4100D Mountain Trail |
9:03:06 h | 33 |
| 2013 | ||||
| 20.10 | 71km | 4th OSJ Hyonosen Mountains Trail Race |
8:25:45 h | 1 🏆 |
| 2007 | ||||
| 27.05 | 50km | OSJ Hakone 50K |
7:11:19 h | 10 |
| 2005 | ||||
| 09.10 | 71.5km | 13th Hasetsune Cup - Japan Mountain Endurance Race |
10:20:55 h | 33 |
| 16.01 | 100km | 15th Miyako 100 km Ultramarathon |
8:44:14 h | 5 |
| 2004 | ||||
| 17.10 | 100km | 10th River Shimanto 100km |
8:49:00 h | 43 |
| 10.10 | 71.5km | 12th Hasetsune Cup - Japan Mountain Endurance Race |
11:05:34 h | 25 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 19/4/2026 | 17th 100 km Ultra Maranic Osaka | 100,00 | ×3 |
| ✓ 2 | 20/4/2025 | 16th 100 km Ultra Maranic Osaka | 100,00 | ×3 |
| ✓ 3 | 23/4/2023 | 14th 100 km Ultra Maranic Osaka | 100,00 | ×3 |
| ✓ 4 | 16/1/2005 | 15th Miyako 100 km Ultramarathon | 100,00 | ×3 |
| ✓ 5 | 17/10/2004 | 10th River Shimanto 100km | 100,00 | ×3 |
| ✓ 6 | 19/10/2014 | 5th OSJ Hyonosen Mountains Trail Race | 73,00 | ×2 |
| ✓ 7 | 9/10/2005 | 13th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 8 | 10/10/2004 | 12th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 9 | 20/10/2013 | 4th OSJ Hyonosen Mountains Trail Race | 71,00 | ×2 |
| ✓ 10 | 21/4/2024 | 15th 70 km Ultra Maranic Osaka | 70,00 | ×2 |
| ✓ 11 | 17/4/2022 | 13th 70 km Ultra Maranic Osaka | 70,00 | ×2 |
| ✓ 12 | 20/7/2014 | 5th Nozawa Onsen 4100D Mountain Trail | 65,00 | ×2 |
| ✓ 13 | 18/10/2020 | 23th Mt. Rocco Cannonball Run - 56 km Speed | 56,00 | ×1 |
| ✓ 14 | 27/5/2007 | OSJ Hakone 50K | 50,00 | ×1 |