Yasuyuki (大西靖之) Onishi
ID 77441
Born : 1969 Cat. M55 Ultrarunner since 2006 JPN
45
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
59
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
2
Countries visited ?JPNJapanUSAUnited States
6,4%
Rank quotient ?This runner's calculation uses 46 eligible race(s): Σ(rank − 1) = 1 287; Σ finishers = 20 003. 1 287 / 20 003 × 100 = 6.43%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed46
Km — ultra races4 926 km
> 100 km14
> 160 km7
> 200 km4
> 24h3
Longest race415,0 km
7th Trans Japan Alps Race (TJAR) — 10/8/2014

Km per year (ultra races)

134
2 races
2022
359
5 races
2023
225
3 races
2024
172
2 races
2025
145
2 races
2026

Race types (share of distance)

Road36,0%
Trail64,0%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 33
🏅 Top 3 M3
Longest winning streak0
Current streak0

Records

50 km4h32'11100 km8h17'38100 mi19h21'0712 h125,64 km24 h203,82 km

HISTORY

46 race(s)
DateRacePerf.Rk
2026
26.04 45km JPN19th Ishioka Trail Run 4:45:24 h27
08.03 100km JPN8th Ibaraki 100k Ultra Marathon 9:45:44 h103
2025
12.10 71.5km JPN33th Hasetsune Cup - Japan Mountain Endurance Race 12:47:06 h153
09.03 100km JPN7th Ibaraki 100k Ultra Marathon 9:34:11 h46
2024
13.10 71.5km JPN32th Hasetsune Cup - Japan Mountain Endurance Race 11:44:55 h178
17.08 53km USA7th Cloudcroft Ultra Run 6:21:51 h13
10.03 100km JPN6th Ibaraki 100k Ultra Marathon 8:51:53 h28
2023
08.10 71.5km JPN31th Hasetsune Cup - Japan Mountain Endurance Race 10:21:57 h89
27.08 75km JPN10th Tsukuba Renjyo 70 km Road & Trail Run 9:24:14 h11
28.05 62km JPN15th OSJ Okukuji Trail 60k 10:35:40 h10
29.04 50km JPN16th Ishioka Trail Run 5:16:07 h6
12.03 100km JPN5th Ibaraki 100k Ultra Marathon 8:17:38 h7
2022
28.08 75km JPN9th Tsukuba Renjyo 70 km Road & Trail Run 8:19:39 h3 🥉
28.05 59km JPN14th OSJ Okukuji Trail 60k 9:02:09 h8
2021
25.04 50km JPN14th Ishioka Trail Run 4:32:11 h6
2019
01.06 59km JPN11th OSJ Okukuji Trail 60k 8:21:58 h10
2018
02.06 50km JPN10th OSJ Okukuji Trail 50k 8:38:13 h7
2017
08.10 71.5km JPN25th Hasetsune Cup - Japan Mountain Endurance Race 10:02:43 h37
27.05 50km JPN9th OSJ Okukuji Trail 50k 8:37:04 h11
29.04 49km JPN10th Ishioka Trail Run 4:48:25 h10
2016
10.09 50km USA2nd Franklin Mountains Trail Run 6:06:38 h7
28.05 50km JPN8th OSJ Okukuji Trail 50k 8:38:38 h14
2015
25.09 170.3km JPN4th Ultra-Trail Mt. Fuji 28:22:53 h47
18.07 100mi JPN8th OSJ Ontake 100 Mile Ultra Trail 19:21:07 h7
30.05 50km JPN7th OSJ Okukuji Trail 50k 8:28:25 h5
19.04 118km JPN25th Fuji 5 Lakes 118 km Challenge 10:18:42 h8
2014
31.08 70km JPN1st Tsukuba Renjyo 70 km Road & Trail Run 9:12:38 h31
10.08 415km JPN7th Trans Japan Alps Race 6d 21:04:00 h7
31.05 50km JPN6th OSJ Okukuji Trail 50k 8:26:22 h6
20.04 108km JPN24th Fuji 5 Lakes 108 km Challenge 9:07:28 h8
2012
12.08 415km JPN6th Trans Japan Alps Race 7d 12:54:00 h10
16.06 12h JPN11. Tokyo Challenge 12 hours 125.640 km5
22.04 112km JPN22nd Fuji 5 Lakes 112 km Challenge 10:40:40 h30
2011
24.09 24h JPN14. Hiratsuka 24 hour race 72.660 km46
05.06 50km JPN3rd OSJ Okukuji Trail 50k 7:09:55 h12
30.04 112km JPN21st Fuji 5 Lakes 112 km Challenge 9:29:16 h6
2010
10.10 71.5km JPN18th Hasetsune Cup - Japan Mountain Endurance Race 10:56:52 h99
08.08 415km JPN5th Trans Japan Alps Race 7d 18:41:00 h12
25.04 112km JPN20th Fuji 5 Lakes 112 km Challenge 9:42:26 h10
11.04 50km JPN2nd OSJ Okukuji Trail 50k 8:21:52 h9
2009
11.10 71.5km JPN17th Hasetsune Cup - Japan Mountain Endurance Race 9:23:52 h39
19.07 100km JPN2nd OSJ Ontake 100km Ultra Trail 13:53:17 h98
13.06 24h JPN8. Tokyo Challenge 24 hours 203.820 km3 🥉
26.04 112km JPN19th Fuji 5 Lakes 112 km Challenge 9:51:41 h7
2007
14.09 24h JPN10. Hiratsuka 24 hour race 197.220 km3 🥉
2006
15.10 100km JPN12th River Shimanto 100km 9:07:33 h41