Progress against the field
Between Gent 2025 and Rotterdam 2026, Iris Ijzermans and Sam Van der Heijden pulled 7:08 ahead of the field.
Over the same races everyone got 3:16 quicker, so 10:24 faster on the clock looks better than it was.
The biggest step was Amsterdam 2026 → Rotterdam 2026: 6:48 on the field 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 2026Doubles Open · Women1:21:02 PB187/513Beat 64%
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Rotterdam15 Apr 2026Doubles Open · Women1:24:49432/936Beat 54%
↑ 84 days after Amsterdam 2026, with Sam Van der Heijden 6:48 better than the field Why ↓Close ↑
7:48 faster on the clock, and the race was 1:00 faster for everyone, so 6:48 of it was this pair.
The fieldCompare these two →1:00 faster This pair7:48 faster -
Amsterdam21 Jan 2026Doubles Open · Women1:32:37219/307Beat 29%
↑ 40 days after Gent 2025, with Sam Van der Heijden 0:20 better than the field Why ↓Close ↑
2:36 faster on the clock, and the race was 2:16 faster for everyone, so 0:20 of it was this pair.
The fieldCompare these two →2:16 faster This pair2:36 faster -
Gent12 Dec 2025Doubles Open · Women1:35:13674/882Beat 24%