Progress against the field
Between Maastricht 2024 and Hamburg 2024, Jeroen Koks lost 4:25 to the field.
Over the same races everyone got 6:30 quicker, so 2:05 faster on the clock looks better than it was.
The longest gap between two races compared here, 187 days between Rotterdam 2024 and Amsterdam 2024, cost 5:46 on 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. The summary above covers Individual Open · Men, the one raced most; every comparison is in the list below.
Every race
10 races · 9 events
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Utrecht28 Nov 2025Individual Pro · Men1:40:19 PB182/215Beat 15%
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Hamburg2 Nov 2024Individual Open · Men1:16:47 PB328/1248Beat 74%
↑ 23 days after Amsterdam 2024 0:13 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:19 faster on the clock, yet the race was 1:32 faster for everyone, so 0:13 was lost on the field.
The fieldCompare these two →1:32 faster This athlete1:19 faster -
Amsterdam10 Oct 2024Individual Open · Men1:18:06404/1539Beat 74%
↑ 187 days after Rotterdam 2024 5:46 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:01 faster on the clock looks better than it was: the race was 6:47 faster for everyone, which leaves this 5:46 behind the field.
The fieldCompare these two →6:47 faster This athlete1:01 faster -
Rotterdam6 Apr 2024Individual Open · Men1:19:07203/1380Beat 85%
↑ 77 days after Maastricht 2024 1:34 better than the field Slower on the clock, ahead of the field Why ↓Close ↑
0:15 slower on the clock in a race that was 1:49 slower for everyone: 1:34 gained on the field, which the clock hides.
The fieldCompare these two →1:49 slower This athlete0:15 slower -
Maastricht20 Jan 2024Individual Open · Men1:18:52211/781Beat 73%
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Barcelona18 Nov 2023Doubles Open · Men1:13:39 PB197/350Beat 44%
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Amsterdam4 Nov 2023Doubles Open · Men1:15:23170/411Beat 59%
↑ 168 days after Rotterdam 2023, with Roderick Cremers 0:32 better than the field Why ↓Close ↑
1:58 faster on the clock, and the race was 1:26 faster for everyone, so 0:32 of it was this pair.
The fieldCompare these two →1:26 faster This pair1:58 faster -
Amsterdam4 Nov 2023Relay · Mixed1:32:5317/22Beat 23%
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Rotterdam20 May 2023Doubles Open · Men1:17:21124/249Beat 50%
↑ 119 days after Maastricht European Championships 2023, with Roderick Cremers 1:45 better than the field Why ↓Close ↑
3:54 faster on the clock, and the race was 2:09 faster for everyone, so 1:45 of it was this pair.
The fieldCompare these two →2:09 faster This pair3:54 faster -
Maastricht European Championships21 Jan 2023Doubles Open · Men1:21:15138/185Beat 25%