Masayuki (小沼マサユキ) Onuma
Born : 1972 Cat. M50 Ultrarunner since 2013 JPN
23
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
33
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
8,4%
Rank quotient ?This runner's calculation uses 23 eligible race(s): Σ(rank − 1) = 1 736; Σ finishers = 20 741. 1 736 / 20 741 × 100 = 8.37%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed23
Km — ultra races1 376 km
Longest race100,0 km

Km per year (ultra races)

72
1 race
2022
72
1 race
2023
122
2 races
2024
122
2 races
2025
2026

Race types (share of distance)

Road7,3%
Trail92,7%

Wins & podiums (ultra)

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

HISTORY

23 race(s)
DateRacePerf.Rk
2025
30.11 50km JPN12th Trainic world Soto-Chichibu Trail Run 50km 7:24:36 h18
12.10 71.5km JPN33th Hasetsune Cup - Japan Mountain Endurance Race 13:31:30 h195
2024
01.12 50km JPN11th Trainic world Soto-Chichibu Trail Run 50km 6:43:47 h10
13.10 71.5km JPN32th Hasetsune Cup - Japan Mountain Endurance Race 10:05:51 h57
2023
08.10 71.5km JPN31th Hasetsune Cup - Japan Mountain Endurance Race 14:22:53 h475
2022
09.10 71.5km JPN30th Hasetsune Cup - Japan Mountain Endurance Race 10:27:01 h78
2019
30.06 100km JPN34. Lake Saroma 100 km Ultramarathon 9:50:43 h342
28.04 49km JPN12th Ishioka Trail Run 5:59:04 h72
2018
07.10 71.5km JPN26th Hasetsune Cup - Japan Mountain Endurance Race 11:02:42 h63
09.09 51.4km JPN8th Hakuba Int. Trail Run 5:39:09 h19
26.08 48km JPN5th Tsukuba Renjyo 48 km Road & Trail Run 5:42:32 h13
2017
10.09 51.4km JPN7th Hakuba Int. Trail Run 5:15:43 h10
27.08 48km JPN4th Tsukuba Renjyo 48 km Road & Trail Run 4:39:01 h3 🥉
2016
09.10 71.5km JPN24th Hasetsune Cup - Japan Mountain Endurance Race 9:50:02 h35
11.09 53km JPN6th Hakuba Int. Trail Run 5:22:44 h8
28.08 48km JPN3rd Tsukuba Renjyo 48 km Road & Trail Run 4:27:06 h5
2015
31.10 71.5km JPN23rd Hasetsune Cup - Japan Mountain Endurance Race 9:56:05 h98
13.09 53km JPN5th Hakuba Int. Trail Run 5:50:48 h15
30.08 48km JPN2nd Tsukuba Renjyo 48 km Road & Trail Run 4:35:13 h3 🥉
2014
14.09 53km JPN4th Hakuba Int. Trail Run 7:00:03 h65
31.08 48km JPN1st Tsukuba Renjyo 48 km Road & Trail Run 4:58:02 h2 🥈
2013
13.10 71.5km JPN21st Hasetsune Cup - Japan Mountain Endurance Race 10:38:20 h142
15.09 53km JPN3rd Hakuba Int. Trail Run 6:00:13 h31