Progress against the field
Jurriaan Grubben has dropped 3:12 behind the field from Rotterdam 2023 to Rotterdam 2025.
Over the same races everyone got 9:37 quicker, so 6:25 faster on the clock looks better than it was.
The longest gap between two races compared here, 327 days between Rotterdam 2024 and Rotterdam 2025, cost 6:21 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
5 races · 5 events
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Heerenveen14 May 2026Doubles Open · Men1:22:29 PB402/494Beat 19%
↑ 153 days after Gent 2025, with Sander van der Aa 1:11 better than the field Why ↓Close ↑
1:11 better than the field: 3:20 faster on the clock, against 2:09 faster for everyone.
The fieldCompare these two →2:09 faster This pair3:20 faster -
Gent12 Dec 2025Doubles Open · Men1:25:491019/1164Beat 13%
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Rotterdam27 Feb 2025Individual Open · Men1:39:48 PB491/600Beat 18%
↑ 327 days after Rotterdam 2024 6:21 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:13 faster on the clock looks better than it was: the race was 6:34 faster for everyone, which leaves this 6:21 behind the field.
The fieldCompare these two →6:34 faster This athlete0:13 faster -
Rotterdam6 Apr 2024Individual Open · Men1:40:011009/1380Beat 27%
↑ 322 days after Rotterdam 2023 3:09 better than the field Why ↓Close ↑
6:12 faster on the clock, and the race was 3:03 faster for everyone, so 3:09 of it was this athlete.
The fieldCompare these two →3:03 faster This athlete6:12 faster -
Rotterdam20 May 2023Individual Open · Men1:46:13485/575Beat 16%