Chow-Seng Tan
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Born : 1984
Cat. M40 Ultrarunner since 2011
15
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
5
Countries visited ?
IndonesiaMalaysia
Singapore
Thailand
Vietnam
IndonesiaMalaysiaSingaporeThailandVietnam13,0%
Rank quotient ?This runner's calculation uses 15 eligible race(s): Σ(rank − 1) = 308; Σ finishers = 2 368. 308 / 2 368 × 100 = 13.01%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed15
Km — ultra races1 247 km
> 100 km1
Longest race106,0 km
9th Borneo Ultra Trail Marathon BUTM - 100 km — 22/2/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road27,8%
Trail72,2%
Wins & podiums (ultra)
🏆 Win1
🏆 Win M1
🏅 Top 33
🏅 Top 3 M3
Longest winning streak1
Current streak0
HISTORY
15 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 15.05 | 100km | 4th BTR Ultra |
29:09:29 h | 44 |
| 2025 | ||||
| 19.09 | 100km | 12th Vietnam Mountain Marathon 100km |
23:08:41 h | 64 |
| 22.02 | 106km | 9th Borneo Ultra Trail Marathon BUTM - 100 km |
19:33:24 h | 7 |
| 2024 | ||||
| 07.12 | 93km | 1st Chiangmai Thailand by UTMB - ELEPHANT 100 |
15:38:46 h | 68 |
| 21.09 | 50km | 2nd Kailas Mount Ophir Ultra Trail |
11:32:51 h | 10 |
| 22.06 | 50km | 1st Trans QJM Gunung Pulai Ultra |
14:03:00 h | 19 |
| 2023 | ||||
| 09.12 | 12h | 1st Sireh Park Ultra |
76.500 km | 2 🥈 |
| 09.09 | 50km | 3rd Ultimate Trails of the South 50km |
10:11:08 h | 1 🏆 |
| 15.07 | 100km | 7th Cameron 100 km Ultra Trail |
20:55:43 h | 18 |
| 03.06 | 100km | 2nd Merapoh Rainforest Trail - 100 km |
14:28:36 h | 3 🥉 |
| 2019 | ||||
| 30.11 | 100km | 1st Sekinchan Ultra 100km |
11:53:57 h | 4 |
| 2018 | ||||
| 01.09 | 70km | 3rd Fraser Ultra 70 km |
7:19:35 h | 5 |
| 2016 | ||||
| 08.10 | 100km | 1st Cameron 100 km Ultra Trail |
18:38:51 h | 6 |
| 2014 | ||||
| 15.02 | 100km | TITI 100km Road Ultra Marathon |
12:56:00 h | 9 |
| 2011 | ||||
| 18.12 | 12h | 3rd MR25 Cross Country Ultra Marathon |
51.000 km | 63 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 22/2/2025 | 9th Borneo Ultra Trail Marathon BUTM - 100 km | 106,00 | ×3 |
| ✓ 2 | 15/5/2026 | 4th BTR Ultra | 100,00 | ×3 |
| ✓ 3 | 19/9/2025 | 12th Vietnam Mountain Marathon 100km | 100,00 | ×3 |
| ✓ 4 | 15/7/2023 | 7th Cameron 100 km Ultra Trail | 100,00 | ×3 |
| ✓ 5 | 3/6/2023 | 2nd Merapoh Rainforest Trail - 100 km | 100,00 | ×3 |
| ✓ 6 | 30/11/2019 | 1st Sekinchan Ultra 100km | 100,00 | ×3 |
| ✓ 7 | 8/10/2016 | 1st Cameron 100 km Ultra Trail | 100,00 | ×3 |
| ✓ 8 | 15/2/2014 | TITI 100km Road Ultra Marathon | 100,00 | ×3 |
| ✓ 9 | 7/12/2024 | 1st Chiangmai Thailand by UTMB - ELEPHANT 100 | 93,00 | ×2 |
| ✓ 10 | 9/12/2023 | 1st Sireh Park Ultra | 76,50 | ×2 |
| ✓ 11 | 1/9/2018 | 3rd Fraser Ultra 70 km | 70,00 | ×2 |
| ✓ 12 | 18/12/2011 | 3rd MR25 Cross Country Ultra Marathon | 51,00 | ×1 |
| ✓ 13 | 21/9/2024 | 2nd Kailas Mount Ophir Ultra Trail | 50,00 | ×1 |
| ✓ 14 | 22/6/2024 | 1st Trans QJM Gunung Pulai Ultra | 50,00 | ×1 |
| ✓ 15 | 9/9/2023 | 3rd Ultimate Trails of the South 50km | 50,00 | ×1 |