Sep De Jong
NetherlandsActive- Born
- May 19, 2006 (20 years old)
- Events
- 400 m hurdles · 400 Metres Short Track
Sep De Jong is a Netherlands sprinter, born on May 19, 2006. He competes primarily in the 200m, 400m and 400m.
His personal bests include 23.01 in the 200m, 49.63 in the 400m, 50.14 in the 400m, 1:55.79 in the 800m and 1:56.10 in the 800m. He is currently active on the international athletics circuit, representing Netherlands.
Personal best · 400 m hurdles52.08
2026 season best52.53Jul 4, 2026
Personal best · 400 Metres Short Track49.63
Last competitionDutch ChampionshipsJul 25, 2026 · 52.82
As of Nov 6, 2026: 400 m hurdles 52.08, 400 Metres Short Track 49.63, 2026 season best 52.53 (Jul 4, 2026) · Last competition: Dutch Championships, Jul 25, 2026, 52.82 · 20 years old
Personal bests
WA points calculator →DisciplineResultAll-time2026
200mIndoorDortmund 202423.01850 pts––
400mIndoorApeldoorn 202449.63941 pts––
800mIndoorApeldoorn 20261:55.79918 pts––
Progression
| Season | Discipline | Result | Wind | Date | Competitions |
|---|---|---|---|---|---|
| 2026 | 400m Indoor | 50.70 | – | Feb 14, 2026 | Run & Fly Meeting |
| 2026 | 400m-short-track Indoor | 50.70 | – | Feb 14, 2026 | Run & Fly Meeting |
| 2026 | 400mH | 52.53 | – | Jul 4, 2026 | Meeting voor Mon - Polsstokgala |
| 2026 | 800m-short-track | 1:55.79 | – | Jan 31, 2026 | 16e AV PEC 1910 |
| 2026 | 800m-short-track Indoor | 1:56.13 | – | Feb 28, 2026 | Dutch Indoor Championships |
| 2026 | 800m Indoor | 1:56.21 | – | May 31, 2026 | Competitie 1e Divisie Poule 2 R2 |
| 2026 | 800m | 1:56.21 | – | May 31, 2026 | Competitie 1e Divisie Poule 2 R2 |
| 2025 | 60mH Indoor | 8.18 | – | Feb 2, 2025 | 8e ITS SOTRA |