Progress against the field
Between Amsterdam 2024 and Amsterdam 2026, Sijmon de Boer lost 4:18 to the field.
Over the same races everyone got 6:19 quicker, so 2:01 faster on the clock looks better than it was.
The longest gap between two races compared here, 328 days between Rotterdam 2025 and Amsterdam 2026, cost 3:39 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.
Every race
4 races · 4 events
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Heerenveen14 May 2026Doubles Open · Men1:01:58 PB63/494Beat 87%
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Amsterdam21 Jan 2026Individual Open · Men1:09:56 PB181/1620Beat 89%
↑ 328 days after Rotterdam 2025 3:39 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:44 faster on the clock looks better than it was: the race was 4:23 faster for everyone, which leaves this 3:39 behind the field.
The fieldCompare these two →4:23 faster This athlete0:44 faster -
Rotterdam27 Feb 2025Individual Open · Men1:10:4086/1283Beat 93%
↑ 140 days after Amsterdam 2024 0:39 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:17 faster on the clock looks better than it was: the race was 1:56 faster for everyone, which leaves this 0:39 behind the field.
The fieldCompare these two →1:56 faster This athlete1:17 faster -
Amsterdam10 Oct 2024Individual Open · Men1:11:5773/659Beat 89%