Progress against the field
Kimberley Geisterfer and Brenda Sluijk have gained 4:05 on the field from Amsterdam 2026 to Heerenveen 2026.
The clock says 8:19 faster, but the races themselves got 4:14 quicker for everyone.
The biggest step was Amsterdam 2026 → Rotterdam 2026: 2:57 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 · Women1:19:29 PB73/246Beat 70%
↑ 29 days after Rotterdam 2026, with Brenda Sluijk 1:08 better than the field Why ↓Close ↑
4:22 faster on the clock, and the race was 3:14 faster for everyone, so 1:08 of it was this pair.
The fieldCompare these two →3:14 faster This pair4:22 faster -
Rotterdam15 Apr 2026Doubles Open · Women1:23:51167/466Beat 64%
↑ 84 days after Amsterdam 2026, with Brenda Sluijk 2:57 better than the field Why ↓Close ↑
3:57 faster on the clock, and the race was 1:00 faster for everyone, so 2:57 of it was this pair.
The fieldCompare these two →1:00 faster This pair3:57 faster -
Amsterdam21 Jan 2026Doubles Open · Women1:27:48626/1030Beat 39%
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Utrecht28 Nov 2025Doubles Pro · Women1:29:47 PB31/59Beat 48%