Progress against the field
From Amsterdam 2026 to Heerenveen 2026, Leroy Koelewijn got 3:56 faster than the field.
Over the same races everyone got 3:55 quicker, so 7:51 faster on the clock looks better than it was.
The largest gain on the field came from Amsterdam 2026 → Rotterdam 2026: 3:16 in 84 days.
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
4 races · 4 events
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Heerenveen14 May 2026Individual Open · Men1:21:44 PB227/490Beat 54%
↑ 29 days after Rotterdam 2026 0:40 better than the field Why ↓Close ↑
2:27 faster on the clock, and the race was 1:47 faster for everyone, so 0:40 of it was this athlete.
The fieldCompare these two →1:47 faster This athlete2:27 faster -
Rotterdam15 Apr 2026Individual Open · Men1:24:11232/570Beat 59%
↑ 84 days after Amsterdam 2026 3:16 better than the field Why ↓Close ↑
5:24 faster on the clock, and the race was 2:08 faster for everyone, so 3:16 of it was this athlete.
The fieldCompare these two →2:08 faster This athlete5:24 faster -
Amsterdam21 Jan 2026Individual Open · Men1:29:35399/608Beat 34%
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Utrecht28 Nov 2025Doubles Open · Mixed1:22:25 PB311/701Beat 56%