Ryotaro (山口亮太郎) Yamaguchi
ID 275626
Born : 1975 Cat. M50 Ultrarunner since 2010 JPN
37
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
1
Countries visited ?JPNJapan
8,3%
Rank quotient ?This runner's calculation uses 37 eligible race(s): Σ(rank − 1) = 2 667; Σ finishers = 32 298. 2 667 / 32 298 × 100 = 8.26%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed37
Km — ultra races3 500 km
> 100 km10
> 160 km5
Longest race169,0 km
4th Lake Biwa 100 — 11/10/2024

Km per year (ultra races)

378
4 races
2022
363
3 races
2023
373
4 races
2024
161
1 race
2025
100
1 race
2026

Race types (share of distance)

Road28,6%
Trail71,4%

Records

50 km7h55'09100 km8h40'30100 mi26h47'52

HISTORY

37 race(s)
DateRacePerf.Rk
2026
17.05 100km JPN32th Yatsugatake Nobeyama 100 km 10:16:35 h74
2025
17.05 100mi JPN10th Trainic World 100 Mile in Sai-No-Kuni 34:19:42 h90
2024
11.10 169km JPN4th Lake Biwa 100 35:53:32 h30
07.09 53.4km JPN17th OSJ Adatara Trail 50K 9:42:49 h27
30.06 100km JPN39. Lake Saroma 100 km Ultramarathon 8:40:30 h66
12.05 51km JPN5th FunTrails Round Minano 6:10:00 h5
2023
16.09 162.6km JPN15th Shinetsu Five Mountains Trail 100 mile 26:47:52 h36
04.06 100km JPN2. OSJ Aizu Bandaisan Ultramarathon - 100 km 10:06:03 h8
16.04 100km JPN33th Fuji 4 Lakes 100 km Challenge 9:54:50 h85
2022
09.10 71.5km JPN30th Hasetsune Cup - Japan Mountain Endurance Race 10:11:11 h64
16.07 106.5km JPN14th OSJ Ontake 100km Ultra Trail 12:26:30 h54
05.06 100km JPN1. OSJ Aizu Bandaisan Ultramarathon - 100 km 10:28:43 h43
17.04 100km JPN32th Fuji 5 Lakes 100 km Challenge 9:28:24 h70
2021
04.09 50km JPN14th OSJ Adatara Trail 50K 10:07:33 h20
2020
06.09 50km JPN13th OSJ Adatara Trail 50K 7:55:09 h57
2019
01.09 50km JPN12th OSJ Adatara Trail 50K 9:36:04 h25
2018
09.09 51.4km JPN8th Hakuba Int. Trail Run 5:41:08 h20
22.04 100km JPN28th Fuji 5 Lakes 100 km Challenge 9:29:14 h56
2017
10.09 51.4km JPN7th Hakuba Int. Trail Run 5:25:58 h15
23.04 100km JPN27th Fuji 5 Lakes 100 km Challenge 9:50:59 h133
26.03 100km JPN13th Izu Oshima Ultra 100 km 13:21:24 h110
2016
09.10 71.5km JPN24th Hasetsune Cup - Japan Mountain Endurance Race 11:09:16 h124
24.04 100km JPN26th Fuji 5 Lakes 100 km Challenge 9:29:42 h66
2015
31.10 71.5km JPN23rd Hasetsune Cup - Japan Mountain Endurance Race 9:30:15 h60
18.07 100km JPN8th OSJ Ontake 100km Ultra Trail 11:53:45 h42
2014
12.10 71.5km JPN22nd Hasetsune Cup - Japan Mountain Endurance Race 9:43:01 h82
30.08 63km JPN1st Shigakogen Extreme Trail 13:42:54 h65
25.04 100mi JPN3rd Ultra-Trail Mt. Fuji 37:00:20 h247
2013
13.10 71.5km JPN21st Hasetsune Cup - Japan Mountain Endurance Race 10:06:45 h102
26.04 100mi JPN2nd Ultra-Trail Mount Fuji 28:41:36 h73
10.03 72km JPN1st Izu Trail Journey 8:50:33 h69
2012
07.10 71.5km JPN20th Hasetsune Cup - Japan Mountain Endurance Race 11:38:23 h222
16.09 110km JPN4th Shinetsu Five Mountains Trail 110km 16:23:56 h71
18.05 156km JPN1st Ultra-Trail Mount Fuji 30:30:08 h70
2011
24.09 110km JPN3rd Shinetsu Five Mountains Trail 110km 14:59:03 h40
2010
10.10 71.5km JPN18th Hasetsune Cup - Japan Mountain Endurance Race 12:38:54 h229
19.09 110km JPN2nd Shinetsu Five Mountains Trail 110km 16:00:04 h54