Progress against the field
Between Heerenveen 2025 and Heerenveen 2026, Jacco van de Bovenkamp pulled 2:05 ahead of the field.
Over the same races everyone got 9:01 quicker, so 11:06 faster on the clock looks better than it was.
The largest gain on the field came from Heerenveen 2025 → Maastricht 2025: 10:16 in 133 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 · Men1:39:20798/966Beat 17%
↑ 167 days after Utrecht 2025 8:50 worse than the field Why ↓Close ↑
8:50 behind the field: 1:43 slower on the clock, against 7:07 faster for everyone.
The fieldCompare these two →7:07 faster This athlete1:43 slower -
Utrecht28 Nov 2025Individual Open · Men1:37:37 PB954/1337Beat 29%
↑ 70 days after Maastricht 2025 0:39 better than the field Why ↓Close ↑
4:15 faster on the clock, and the race was 3:36 faster for everyone, so 0:39 of it was this athlete.
The fieldCompare these two →3:36 faster This athlete4:15 faster -
Maastricht19 Sep 2025Individual Open · Men1:41:521029/1352Beat 24%
↑ 133 days after Heerenveen 2025 10:16 better than the field Why ↓Close ↑
8:34 faster on the clock in a race that was 1:42 slower for everyone: 10:16 better than the field.
The fieldCompare these two →1:42 slower This athlete8:34 faster -
Heerenveen9 May 2025Individual Open · Men1:50:261134/1217Beat 7%