Tomokazu (益田智員) Masuda
ID 2011082
Born : 1977 Cat. M45 Ultrarunner since 2023 JPN
6
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
20
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
79,7%
Rank quotient ?This runner's calculation uses 6 eligible race(s): Σ(rank − 1) = 3 756; Σ finishers = 4 713. 3 756 / 4 713 × 100 = 79.69%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed6
Km — ultra races458 km
Longest race100,0 km
13th Hida Takayama 100 km Ultramarathon — 8/6/2025

Km per year (ultra races)

2022
120
2 races
2023
100
1 race
2024
100
1 race
2025
138
2 races
2026

Race types (share of distance)

Road76,4%
Trail23,6%

Records

50 km8h04'33100 km13h37'0050 mi10h14'27

HISTORY

6 race(s)
DateRacePerf.Rk
2026
20.06 58km JPN2nd Kaga Spa by UTMB - Kaga Spa Trail Endurance 50 11:41:49 h456
19.04 80km JPN36th Fuji 4 Lakes 80 km Challenge 10:14:27 h103
2025
08.06 100km JPN13th Hida Takayama 100 km Ultramarathon 13:57:39 h1634
2024
09.06 100km JPN12th Hida Takayama 100 km Ultramarathon 13:37:00 h1237
2023
04.11 50km JPN10th Nakanoto Treasure Trail Run Festival 8:04:33 h93
15.04 70km JPN2nd Atsumi Peninsula Ultra Nature Run - 70km 10:17:21 h239