Progress against the field
Between Rotterdam 2024 and Heerenveen 2025, Sybren Blokvoort lost 2:26 to the field.
Over the same races everyone got 9:27 quicker, so 7:01 faster on the clock looks better than it was.
The longest gap between two races compared here, 211 days between Amsterdam 2024 and Heerenveen 2025, cost 1:46 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.
Every race
4 races · 4 events
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Utrecht28 Nov 2025Doubles Open · Men58:02 PB12/879Beat 99%
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Heerenveen9 May 2025Individual Open · Men1:08:01 PB13/325Beat 96%
↑ 211 days after Amsterdam 2024 1:46 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:54 faster on the clock looks better than it was: the race was 2:40 faster for everyone, which leaves this 1:46 behind the field.
The fieldCompare these two →2:40 faster This athlete0:54 faster -
Amsterdam10 Oct 2024Individual Open · Men1:08:55112/1539Beat 93%
↑ 187 days after Rotterdam 2024 0:40 worse than the field Faster on the clock, behind the field Why ↓Close ↑
6:07 faster on the clock looks better than it was: the race was 6:47 faster for everyone, which leaves this 0:40 behind the field.
The fieldCompare these two →6:47 faster This athlete6:07 faster -
Rotterdam6 Apr 2024Individual Open · Men1:15:02118/1380Beat 91%