Progress against the field
Johan Kloosterboer has dropped 14:41 behind the field from London Excel 2025 to Berlin 2026.
Over the same races everyone got 0:36 slower, so 15:17 slower on the clock looks worse than it was.
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. The summary above covers Individual Open · Men, the one raced most; every comparison is in the list below.
Every race
11 races · 10 events
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Maastricht19 Sep 2026Doubles Pro · Men1:11:29 PB199/316Beat 37%
↑ 365 days after Maastricht 2025, with Bert Stokkentreeff 1:49 better than the field Why ↓Close ↑
5:49 faster on the clock, and the race was 4:00 faster for everyone, so 1:49 of it was this pair.
The fieldCompare these two →4:00 faster This pair5:49 faster -
Berlin22 May 2026Individual Open · Men1:29:43159/277Beat 43%
↑ 169 days after London Excel 2025 14:41 worse than the field Why ↓Close ↑
14:41 behind the field: 15:17 slower on the clock, against 0:36 slower for everyone.
The fieldCompare these two →0:36 slower This athlete15:17 slower -
Heerenveen14 May 2026Doubles Open · Men1:11:02 PB204/494Beat 59%
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Amsterdam21 Jan 2026Doubles Open · Mixed1:08:11 PB70/506Beat 86%
↑ 278 days after Paris 1 2025, with Erika Schlingmann 4:16 better than the field Why ↓Close ↑
5:52 faster on the clock, and the race was 1:36 faster for everyone, so 4:16 of it was this pair.
The fieldCompare these two →1:36 faster This pair5:52 faster -
Amsterdam21 Jan 2026Relay · Mixed1:08:2122/68Beat 68%
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London Excel4 Dec 2025Individual Open · Men1:14:26 PB680/2771Beat 76%
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Utrecht28 Nov 2025Relay · Men1:15:0730/38Beat 21%
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Maastricht19 Sep 2025Doubles Pro · Men1:17:1888/131Beat 33%
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Heerenveen9 May 2025Relay · Men1:04:3112/21Beat 43%
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Paris 118 Apr 2025Doubles Open · Mixed1:14:03245/832Beat 71%
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Amsterdam10 Oct 2024Doubles Open · Mixed1:22:31175/376Beat 54%