Progress against the field
Between Heerenveen 2025 and Heerenveen 2026, Niek Heijboer lost 3:11 to the field.
The clock says 5:39 faster, but the races themselves got 8:50 quicker for everyone.
The biggest step was Heerenveen 2025 → Maastricht 2025: 5:51 on the field 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
5 races · 5 events
-
Heerenveen14 May 2026Individual Open · Men1:16:37 PB274/966Beat 72%
↑ 113 days after Amsterdam 2026 1:04 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:29 faster on the clock, yet the race was 2:33 faster for everyone, so 1:04 was lost on the field.
The fieldCompare these two →2:33 faster This athlete1:29 faster -
Amsterdam21 Jan 2026Individual Open · Men1:18:06523/1620Beat 68%
↑ 124 days after Maastricht 2025 7:58 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:01 faster on the clock, yet the race was 7:59 faster for everyone, so 7:58 was lost on the field.
The fieldCompare these two →7:59 faster This athlete0:01 faster -
Maastricht19 Sep 2025Individual Open · Men1:18:07138/584Beat 76%
↑ 133 days after Heerenveen 2025 5:51 better than the field Why ↓Close ↑
4:09 faster on the clock in a race that was 1:42 slower for everyone: 5:51 better than the field.
The fieldCompare these two →1:42 slower This athlete4:09 faster -
Heerenveen9 May 2025Individual Open · Men1:22:16492/1217Beat 60%
-
Amsterdam10 Oct 2024Doubles Open · Men1:14:43 PB137/325Beat 58%