Progress against the field
Between Utrecht 2025 and Heerenveen 2026, Henk Burggraaff and Maartje Zwaan pulled 8:29 ahead of the field.
The clock says 14:57 faster, but the races themselves got 6:28 quicker for everyone.
The biggest step was Utrecht 2025 → Rotterdam 2026: 6:05 on the field in 138 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
3 races · 3 events
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Heerenveen14 May 2026Doubles Open · Mixed1:02:49 PB36/808Beat 96%
↑ 29 days after Rotterdam 2026, with Maartje Zwaan 2:24 better than the field Why ↓Close ↑
4:36 faster on the clock, and the race was 2:12 faster for everyone, so 2:24 of it was this pair.
The fieldCompare these two →2:12 faster This pair4:36 faster -
Rotterdam15 Apr 2026Doubles Open · Mixed1:07:2576/1047Beat 93%
↑ 138 days after Utrecht 2025, with Maartje Zwaan 6:05 better than the field Why ↓Close ↑
10:21 faster on the clock, and the race was 4:16 faster for everyone, so 6:05 of it was this pair.
The fieldCompare these two →4:16 faster This pair10:21 faster -
Utrecht28 Nov 2025Doubles Open · Mixed1:17:46189/701Beat 73%