Masayuki (大滝雅之) Otaki
ID 4994
Born : 1964 Cat. M60 Ultrarunner since 2000 JPN
60
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
110
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
8
Countries visited ?AUTAustriaCANCanadaFRAFranceGREGreeceHUNHungaryJPNJapanSWESwedenTPETaiwan
28,6%
Rank quotient ?This runner's calculation uses 61 eligible race(s): Σ(rank − 1) = 1 412; Σ finishers = 4 939. 1 412 / 4 939 × 100 = 28.59%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed61
Km — ultra races15 341 km
> 100 km57
> 160 km53
> 200 km44
> 24h39
> 48h18
Longest race735,7 km
5th EMU 6 Day World Trophy — 6/5/2015

Km per year (ultra races)

2022
744
4 races
2023
772
2 races
2024
244
1 race
2025
138
1 race
2026

Race types (share of distance)

Road88,8%
Trail11,2%

Wins & podiums (ultra)

🏆 Win5
🏆 Win M5
🏅 Top 39
🏅 Top 3 M11
Longest winning streak1
Current streak0

Records

100 km7h26'3412 h118,10 km24 h271,75 km48 h426,45 km6 d735,73 km

HISTORY

68 race(s) · 103 split(s) nested
DateRacePerf.Rk
2026
23.05 24h JPNIAU 24h Asia and Oceania Championships Open 137.500 km74
2025
21.02 48h TPE14th Taipei 48hr Ultra Marathon 244.499 km32
2024
05.09 6d HUN13th GOMU-EMU 6 Day World Championship 537.294 km42
23.02 48h TPE13th Taipei 48hr Ultra Marathon 234.947 km40
2023
01.12 24h TPEIAU 24h WC Taipei (Open) 176.200 km15
01.12 24h TPEIAU 24h WC Taipei (all races combined) 176.200 km192
01.12 12h TPEIAU 24h WC Taipei - 12h Split 106.800 km231
01.12 100mi TPEIAU 24h WC Taipei - 100mi Split 22:25:47 h207
10.06 12h JPN1st Aizu Yanaizu Akabeko Marathon - 12h 118.100 km4
10.02 48h TPE12th Taipei 48hr Ultra Marathon 273.267 km24
2021
17.07 24h JPN1st Japan Trophy 24h 140.000 km46
10.01 200km JPN1st Japan Trophy 200 26:44:00 h24
2020
07.02 48h TPE9th Taipei 48hr Ultra Marathon 266.526 km18
2019
02.11 222km JPN6th Setouchi Angya 2019 32:49:00 h5
15.02 48h TPE8th Taipei 48hr Ultra Marathon 286.416 km16
2018
28.09 246km GRE36. Spartathlon 32:47:41 h85
09.02 48h TPE7th Taipei 48hr Ultra Marathon 245.973 km26
2017
02.12 24h TPE17th Soochow/Taipei 24h Ultramarathon 211.451 km16
29.09 246km GRE35. Spartathlon 33:20:45 h122
18.06 100km JPN12. Okinoshima 100km Ultra Marathon 9:22:40 h18
10.02 48h TPE6th Taipei 48hr Ultra Marathon 283.590 km12
2016
03.12 24h TPE16th Soochow/Taipei 24h Ultramarathon 163.448 km28
30.09 246km GRE34. Spartathlon 35:03:40 h165
04.05 6d HUN6th EMU 6 Day World Trophy 650.948 km15
29.01 48h TPE5th Taipei 48hr Ultra Marathon 313.337 km8
2015
21.11 24h TPE15th Soochow/Taipei 24h Ultramarathon 208.519 km13
25.09 246km GRE33. Spartathlon 33:44:05 h80
06.05 6d HUN5th EMU 6 Day World Trophy 735.729 km8
13.02 48h TPE4th Taipei 48hr Ultra Marathon 323.947 km6
2014
06.12 24h TPE14th Soochow/Taipei 24h Ultramarathon 187.220 km23
26.09 245.3km GRE32. Spartathlon 31:43:17 h45
14.02 48h TPE3rd Taipei 48hr Ultra Marathon 347.839 km1 🏆
2013
07.12 24h TPE13th Soochow/Taipei 24h Ultramarathon 184.246 km27
23.08 48h SWESkövde Ultrafestival 48h 283.545 km5
2012
08.12 24h TPE12th Soochow/Taipei 24h Ultramarathon 186.269 km13
04.08 24h JPN13th 24-hour relay & solo marathon Kobe 189.200 km4
2011
10.12 24h TPE11th Soochow/Taipei 24h Ultramarathon 209.359 km10
15.10 12h JPN6th Jingu Gaien Ultramarathon 12 Hour 116.688 km2 🥈
2009
12.12 24h TPE9th Soochow/Taipei 24h Ultramarathon 192.454 km14
25.09 245.3km GRE27. Spartathlon 32:23:26 h45
22.05 12h FRA24ème des 48 heures pédestres de Surgères - 12h Split 116.715 km5
22.05 24h FRA24ème des 48 heures pédestres de Surgères - 24h Split 195.430 km9
22.05 48h FRA24ème des 48 heures pédestres de Surgères 351.956 km7
2008
13.12 24h TPE8th Soochow/Taipei 24h Ultramarathon 232.539 km3 🥉
26.09 245.3km GRE26. Spartathlon 27:37:36 h9
16.05 24h FRA23ème des 48 heures pédestres de Surgères - 24h Split 219.859 km3 🥉
16.05 48h FRA23ème des 48 heures pédestres de Surgères 340.797 km8
2007
28.07 24h CANIAU 24h WC 24 Drummondville 253.814 km3 🥉
11.05 12h FRA22ème des 48 heures pédestres de Surgères - 12h Split 126.667 km1 🏆
11.05 24h FRA22ème des 48 heures pédestres de Surgères - 24h Split 234.637 km1 🏆
11.05 48h FRA22ème des 48 heures pédestres de Surgères 426.448 km1 🏆
2006
29.09 245.3km GRE24. Spartathlon 25:19:12 h3 🥉
25.02 24h TPEIAU 24h WC Taipei Yuanshan 244.572 km5
2005
30.09 245.3km GRE23. Spartathlon 29:08:02 h8
16.07 24h AUTIAU 24h WC Wörschach 245.628 km9
13.05 48h FRA20ème des 48 heures pédestres de Surgères 405.639 km1 🏆
03.04 24h TPE6th Soochow/Taipei 24h ultramarathon 203.600 km12
2004
27.06 100km JPN19. Lake Saroma 100 km Ultramarathon 7:26:34 h7
27.03 24h TPE5th Soochow/Taipei 24h ultramarathon 271.750 km1 🏆
2003
26.09 245.3km GRE21. Spartathlon 26:27:34 h4
08.03 24h TPE4th Soochow/Taipei 24h ultramarathon 235.294 km4
2002
27.09 245.3km GRE20. Spartathlon 31:18:10 h17
02.03 24h TPE3rd Soochow/Taipei 24h ultramarathon 240.090 km4
2001
28.09 245.3km GRE19. Spartathlon 28:52:49 h8
24.06 100km JPN16. Lake Saroma 100 km Ultramarathon 7:49:15 h9
14.04 250km JPN8. Sakura Michi Kokusai Nature Run 29:57:00 h19
2000
29.09 245.3km GRE18. Spartathlon 24:01:10 h1 🏆
25.06 100km JPN15. Lake Saroma 100 km Ultramarathon 7:28:40 h7