Progress against the field
From Amsterdam 2023 to Utrecht 2025, Björn Aertssen got 4:01 faster than the field.
The clock says 9:45 faster, but the races themselves got 5:44 quicker for everyone.
The longest gap between two races compared here, 481 days between Amsterdam 2023 and Rotterdam 2025, still ended 1:32 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. 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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Utrecht28 Nov 2025Individual Open · Men1:17:25 PB114/575Beat 80%
↑ 274 days after Rotterdam 2025 2:29 better than the field Why ↓Close ↑
2:29 better than the field: 3:17 faster on the clock, against 0:48 faster for everyone.
The fieldCompare these two →0:48 faster This athlete3:17 faster -
Belgium5 Apr 2025Doubles Open · Mixed1:17:59281/722Beat 61%
↑ 177 days after Amsterdam 2024, with Zoïe Moerman 1:53 worse than the field Why ↓Close ↑
1:21 slower on the clock in a race that was 0:32 faster for everyone: 1:53 lost to the field.
The fieldCompare these two →0:32 faster This pair1:21 slower -
Rotterdam27 Feb 2025Individual Open · Men1:20:42198/600Beat 67%
↑ 481 days after Amsterdam 2023 1:32 better than the field Why ↓Close ↑
6:28 faster on the clock, and the race was 4:56 faster for everyone, so 1:32 of it was this athlete.
The fieldCompare these two →4:56 faster This athlete6:28 faster -
Amsterdam10 Oct 2024Doubles Open · Mixed1:16:38 PB94/376Beat 75%
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Amsterdam4 Nov 2023Individual Open · Men1:27:10464/1079Beat 57%