Progress against the field
From Rotterdam 2025 to Maastricht 2025, Sem Olierhoek got 11:50 faster than the field.
Over the same races everyone got 0:47 quicker, so 12:37 faster on the clock looks better than it was.
The largest gain on the field came from Rotterdam 2025 → Heerenveen 2025: 27:05 in 71 days.
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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Rotterdam15 Apr 2026Doubles Open · Men1:10:35 PB158/580Beat 73%
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Maastricht19 Sep 2025Individual Open · Men1:42:551052/1352Beat 22%
↑ 133 days after Heerenveen 2025 15:15 worse than the field Why ↓Close ↑
16:57 slower on the clock in a race that was 1:42 slower for everyone: 15:15 lost to the field.
The fieldCompare these two →1:42 slower This athlete16:57 slower -
Heerenveen9 May 2025Individual Open · Men1:25:58 PB639/1217Beat 48%
↑ 71 days after Rotterdam 2025 27:05 better than the field Why ↓Close ↑
27:05 better than the field: 29:34 faster on the clock, against 2:29 faster for everyone.
The fieldCompare these two →2:29 faster This athlete29:34 faster -
Rotterdam27 Feb 2025Individual Open · Men1:55:321216/1283Beat 5%