Progress against the field
From Rotterdam 2023 to Rotterdam 2025, Koen Van Jaarsveld has moved with the field: what changed on the clock changed for everyone.
Over the same races everyone got 5:00 quicker, so 5:00 faster on the clock looks better than it was.
How this is worked out ⓘ
A finish time moves for two reasons: the athlete, and the race — its course, its floor, its day. For each pair of races in a row in one category, we take everyone who raced both and use the middle of how much they moved (the median) as "the race". Whatever is left is the athlete. Doubles are compared only when the same two people raced both, and told as the pair's; relays are left out. A pair with fewer than 15 athletes in common is not shown.
Every race
5 races · 5 events
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Mechelen26 Mar 2026Doubles Open · Men1:09:30 PB287/867Beat 67%
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Utrecht28 Nov 2025Individual Pro · Men1:56:45 PB97/102Beat 5%
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Rotterdam27 Feb 2025Individual Open · Men1:31:26 PB805/1283Beat 37%
↑ 649 days after Rotterdam 2023 0:00 better than the field Why ↓Close ↑
Moved with the field: 5:00 faster on the clock, against 5:00 faster for everyone.
The fieldCompare these two →5:00 faster This athlete5:00 faster -
Rotterdam20 May 2023Individual Open · Men1:36:26392/575Beat 32%
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Amsterdam22 Oct 2022Doubles Open · Men1:17:19131/197Beat 34%