David Witko
ID 557442
Born : 1958 Cat. M65 Ultrarunner since 2014 USA
50
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 ?USAUnited States
52,9%
Rank quotient ?This runner's calculation uses 61 eligible race(s): Σ(rank − 1) = 5 084; Σ finishers = 9 606. 5 084 / 9 606 × 100 = 52.93%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed61
Km — ultra races4 349 km
> 100 km8
> 160 km2
> 24h7
Longest race160,9 km
23rd Kettle Moraine 100 Mile Endurance Run — 2/6/2018

Km per year (ultra races)

171
3 races
2022
2023
255
4 races
2024
541
8 races
2025
437
7 races
2026

Race types (share of distance)

Road13,5%
Trail83,3%
?3,2%

Wins & podiums (ultra)

🏆 Win2
🏆 Win M3
🏅 Top 37
🏅 Top 3 M8
Longest winning streak1
Current streak1

Records

50 km6h03'01100 km15h08'5950 mi11h15'38100 mi26h53'0812 h87,47 km24 h140,56 km

HISTORY

64 race(s) · 2 split(s) nested
DateRacePerf.Rk
2026
05.09 12h USA21st Badgerland F/X 12 Hour Run (night) 72.315 km1 🏆
13.06 38mi USA31st Kettle Moraine 38 Mile Night Run 10:42:04 h28
08.05 38mi USA6th Cocodonan Flagstaff Crest 10:04:42 h142
18.04 60km USA11th Whiskey Basin 60 km Trail Run 10:23:50 h70
28.02 50mi USA8th Grandmaster Ultras 50 Mile Run 13:35:00 h3 🥉
15.02 52km USA13th Black Canyon Trail 50 km Run 7:31:46 h558
31.01 50km USA10th AZT Oracle Rumble 50 km 8:31:04 h55
2025
21.11 12h USA7th Fat Ox 12 Hour Run 87.467 km3 🥉
08.11 50mi USA13th tBunk Endurance Challenge 50 Mile 12:21:30 h35
12.10 50km USA39th Glacial Trail 50 km Race 7:00:45 h44
30.08 12h USA20th Badgerland F/X 12 Hour Run (night) 80.724 km1 🏆
26.04 50km USA12th The Canyons Endurance 50 km Run 7:14:56 h402
12.04 60km USA10th Whiskey Basin 60 km Trail Run 9:12:32 h51
01.03 50mi USA7th Grandmaster Ultras 50 Mile Run 14:04:00 h3 🥉
09.02 52km USA12th Black Canyon Trail 50 km Run 7:26:06 h315
2024
22.11 12h USA6th Fat Ox 12 Hour Run 82.680 km6
10.11 31.2mi USA12th tBunk Endurance Challenge 50 km 6:30:00 h26
13.10 50km USA38th Glacial Trail 50 km Race 7:03:29 h51
31.08 12h USA19th Badgerland F/X 12 Hour Run (night) 72.315 km3 🥉
2022
09.10 50km USA36th Glacial Trail 50 km Race 10:31:04 h92
11.06 38mi USA27th Kettle Moraine 38 Mile Night Run 11:03:25 h28
13.02 59.9km USA9th Black Canyon Trail 60 km Run 9:24:33 h171
2021
10.10 50km USA35th Glacial Trail 50 km Race 6:58:53 h42
10.07 50km USA18th Dances with Dirt - Devil's Lake 50K Ultra 7:37:44 h64
14.02 100km USA8th Black Canyon Trail 100 km Run 16:34:24 h280
16.01 52km USA11th Coldwater Rumble 52K Race 6:29:53 h40
2020
05.09 24h USA15th Badgerland F/X 24 Hour Run 99.224 km14
07.03 50km USA11th Mesquite Canyon 50 km 7:44:30 h53
2019
28.12 24h USA35th Across the Years, 24h 112.976 km50
31.08 24h USA14th Badgerland F/X 24 Hour Run 126.615 km6
24.08 50km USA2nd Six Days in the Dome - The Redux 24h Day 2 - 50km Split 7:14:01 h21
24.08 50mi USA2nd Six Days in the Dome - The Redux 24h Day 2 - 50mi Split 11:48:32 h19
24.08 100km USA2nd Six Days in the Dome - The Redux 24h Day 2 - 100km Split 15:19:51 h18
24.08 24h USA2nd Six Days in the Dome - The Redux 24h Day 2 139.688 km12
06.04 50mi USA25th Umstead Endurance Run 50 Miles 11:15:38 h29
09.03 50km USA10th Mesquite Canyon 50 km 7:21:45 h45
02.03 50km USA30th Way Too Cool 50K Endurance Run 6:03:01 h231
2018
31.12 24h USA34th Across the Years, 24h 108.126 km46
14.10 50mi USA32nd Glacial Trail 50 Mile Race 11:18:48 h26
01.09 24h USA13th Badgerland F/X 24 Hour Run 140.560 km3 🥉
02.06 100mi USA23rd Kettle Moraine 100 Mile Endurance Run 26:53:08 h98
28.04 50km USA5th The Canyons Endurance 50 km Run 7:32:03 h20
17.03 50km USA9th Mesquite Canyon 50 km 6:59:51 h30
03.03 50km USA29th Way Too Cool 50K Endurance Run 6:07:03 h268
17.02 60km USA5th Black Canyon Trail 60 km Run 8:26:30 h70
27.01 50km USA2nd AZT Oracle Rumble 50 km 7:33:31 h33
2017
27.12 24h USA33rd Across the Years, 24h 116.575 km44
07.10 100mi USA27th Arkansas Traveller 100 27:14:30 h43
16.09 50km USA10th Endurance Challenge - Wisconsin Trail 50 km 6:07:07 h62
03.06 38mi USA22nd Kettle Moraine 38 Mile Night Run 9:13:36 h12
13.05 50km USA10th Endurance Challenge - New York Trail 50 km 7:13:14 h210
29.04 50km USA4th The Canyons Endurance 50 km Run 8:12:58 h27
07.04 55km USA6th The Zion 55 km Run 7:41:24 h122
2016
29.10 100km USA14th Javelina Jundred 100 km Endurance Run 15:08:59 h37
10.09 50mi USA26th Superior Fall Trail Races 50 Mile 15:34:45 h60
19.08 12h USA2nd Anchor Down Ultra 12 Hour Run 78.857 km12
14.05 50km USA3rd Gold Rush 50k 6:21:42 h48
30.04 50km USA9th Endurance Challenge - New York Trail 50 km 7:08:12 h264
16.04 50km USA24th Leona Divide 50 km Run 6:42:30 h89
2015
18.07 50mi USA14th Tahoe Rim Trail 50M Endurance Run 14:03:24 h89
05.06 50km USA3rd Bryce 50 km Trail Run 7:50:15 h38
02.05 50km USA2nd The Canyons Endurance 50 km Run 8:31:57 h50
28.03 50km USA23rd Crown King Scramble 50K 7:19:25 h126
2014
03.05 50km USA7th Endurance Challenge - New York Trail 50 km 8:13:44 h264