Progress against the field
From Rotterdam 2023 to Rotterdam 2026, the field gained 15:58 on Wessel Slotemaker.
The clock says 4:29 faster, but the races themselves got 20:27 quicker for everyone.
The longest gap between two races compared here, 237 days between Belgium 2025 and Utrecht 2025, still ended 1:03 ahead of the field.
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
10 races · 10 events
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Rotterdam15 Apr 2026Individual Open · Men1:07:08 PB53/1192Beat 96%
↑ 138 days after Utrecht 2025 2:35 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:44 faster on the clock, yet the race was 5:19 faster for everyone, so 2:35 was lost on the field.
The fieldCompare these two →5:19 faster This athlete2:44 faster -
Amsterdam21 Jan 2026Relay · Mixed1:01:118/68Beat 88%
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Utrecht28 Nov 2025Individual Open · Men1:09:5260/1337Beat 96%
↑ 237 days after Belgium 2025 1:03 better than the field Why ↓Close ↑
1:03 better than the field: 1:26 faster on the clock, against 0:23 faster for everyone.
The fieldCompare these two →0:23 faster This athlete1:26 faster -
Heerenveen9 May 2025Relay · Men55:194/21Beat 81%
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Belgium5 Apr 2025Individual Open · Men1:11:18213/1638Beat 87%
↑ 37 days after Rotterdam 2025 2:19 worse than the field Why ↓Close ↑
1:24 slower on the clock in a race that was 0:55 faster for everyone: 2:19 lost to the field.
The fieldCompare these two →0:55 faster This athlete1:24 slower -
Rotterdam27 Feb 2025Individual Open · Men1:09:5477/1283Beat 94%
↑ 140 days after Amsterdam 2024 6:56 better than the field Why ↓Close ↑
8:52 faster on the clock, and the race was 1:56 faster for everyone, so 6:56 of it was this athlete.
The fieldCompare these two →1:56 faster This athlete8:52 faster -
Amsterdam10 Oct 2024Individual Open · Men1:18:46442/1539Beat 71%
↑ 187 days after Rotterdam 2024 11:39 worse than the field Why ↓Close ↑
11:39 behind the field: 4:52 slower on the clock, against 6:47 faster for everyone.
The fieldCompare these two →6:47 faster This athlete4:52 slower -
Rotterdam6 Apr 2024Individual Open · Men1:13:5490/1380Beat 94%
↑ 154 days after Amsterdam 2023 1:43 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:47 faster on the clock looks better than it was: the race was 2:30 faster for everyone, which leaves this 1:43 behind the field.
The fieldCompare these two →2:30 faster This athlete0:47 faster -
Amsterdam4 Nov 2023Individual Open · Men1:14:41104/1079Beat 90%
↑ 168 days after Rotterdam 2023 5:41 worse than the field Why ↓Close ↑
3:04 slower on the clock in a race that was 2:37 faster for everyone: 5:41 lost to the field.
The fieldCompare these two →2:37 faster This athlete3:04 slower -
Rotterdam20 May 2023Individual Open · Men1:11:3743/575Beat 93%