Progress against the field
Sander van der Aa has gained 0:28 on the field from Rotterdam 2023 to Rotterdam 2024.
The clock says 3:31 faster, but the races themselves got 3:03 quicker for everyone.
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
4 races · 4 events
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Heerenveen14 May 2026Doubles Open · Men1:22:29 PB402/494Beat 19%
↑ 153 days after Gent 2025, with Jurriaan Grubben 1:11 better than the field Why ↓Close ↑
3:20 faster on the clock, and the race was 2:09 faster for everyone, so 1:11 of it was this pair.
The fieldCompare these two →2:09 faster This pair3:20 faster -
Gent12 Dec 2025Doubles Open · Men1:25:491019/1164Beat 13%
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Rotterdam6 Apr 2024Individual Open · Men1:41:29 PB1047/1380Beat 24%
↑ 322 days after Rotterdam 2023 0:28 better than the field Why ↓Close ↑
0:28 better than the field: 3:31 faster on the clock, against 3:03 faster for everyone.
The fieldCompare these two →3:03 faster This athlete3:31 faster -
Rotterdam20 May 2023Individual Open · Men1:45:00478/575Beat 17%