Osamu (岩崎脩) Iwazaki
Born : 1982 Cat. M40 Ultrarunner since 2011 JPN
28
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
50
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
6
Countries visited ?AUSAustraliaFRAFranceHKGHong KongJPNJapanKORSouth KoreaTPETaiwan
47,3%
Rank quotient ?This runner's calculation uses 28 eligible race(s): Σ(rank − 1) = 13 092; Σ finishers = 27 695. 13 092 / 27 695 × 100 = 47.27%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed28
Km — ultra races3 027 km
> 100 km17
> 160 km5
Longest race171,0 km

Km per year (ultra races)

2022
239
2 races
2023
267
2 races
2024
335
3 races
2025
192
2 races
2026

Race types (share of distance)

Road3,3%
Trail96,7%

HISTORY

28 race(s)
DateRacePerf.Rk
2026
06.06 100.8km JPN6th Okushinano 100 15:16:32 h105
07.03 91km TPE1st Xtrail Kenting by UTMB - Xtrail 100K 15:33:32 h90
2025
14.11 120km HKG12th TransLantau 120 by UTMB 25:18:06 h62
20.09 110km KOR7th Seoul Ultra Trail 100K 20:20:28 h92
21.06 105km JPN1st Kaga Spa by UTMB - Kaga Spa Trail Endurance100 22:56:40 h170
2024
12.10 100km KOR11th TransJeju by UTMB 100 19:26:01 h228
26.04 167km JPN9th Ultra-Trail Mt. Fuji 38:52:03 h663
2023
08.10 71.5km JPN31th Hasetsune Cup - Japan Mountain Endurance Race 16:12:43 h708
21.04 167km JPN8th Ultra-Trail Mt. Fuji 38:57:13 h826
2019
30.08 171km FRA17ème Ultra Trail Tour du Mont Blanc 43:06:43 h1029
18.05 100km AUS12th Ultra-Trail Australia 100 km 15:53:20 h391
2018
17.11 106km JPN4th FunTrails100K Round 23:26:12 h98
07.10 71.5km JPN26th Hasetsune Cup - Japan Mountain Endurance Race 17:44:45 h690
31.08 171km FRA16ème Ultra Trail Tour du Mont Blanc 44:42:51 h1397
12.05 108.7km JPN2nd Aso Round Trail 21:56:52 h86
2017
16.09 102km JPN9th Shinetsu Five Mountains Trail 100 mile 19:00:37 h244
13.05 108.7km JPN1st Aso Round Trail 22:43:05 h51
2016
19.11 105km JPN2nd FunTrails100K Round 23:44:33 h126
09.10 71.5km JPN24th Hasetsune Cup - Japan Mountain Endurance Race 14:44:14 h583
18.09 110km JPN8th Shinetsu Five Mountains Trail 110km 16:51:28 h170
2015
21.11 104km JPN1st FunTrails100K Round 22:45:33 h86
31.10 71.5km JPN23rd Hasetsune Cup - Japan Mountain Endurance Race 14:15:30 h757
22.09 110km JPN7th Shinetsu Five Mountains Trail 110km 18:38:01 h253
26.07 80km JPN3rd Mt. Taisetsu Trail Journey 13:46:33 h97
2013
26.04 100mi JPN2nd Ultra-Trail Mount Fuji 41:32:21 h441
2012
07.10 71.5km JPN20th Hasetsune Cup - Japan Mountain Endurance Race 18:19:55 h1311
24.06 100km road race JPN27. Lake Saroma 100 km Ultramarathon 11:54:31 h1256
2011
09.10 71.5km JPN19th Hasetsune Cup - Japan Mountain Endurance Race 18:37:25 h1110