Progress against the field
From Heerenveen 2025 to Rotterdam 2026, Aron Sluimer got 20:27 faster than the field.
Over the same races everyone got 5:26 quicker, so 25:53 faster on the clock looks better than it was.
203 days between Heerenveen 2025 and Utrecht 2025 is the longest gap compared here, and the second race was 22:57 better than 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
6 races · 5 events
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Rotterdam15 Apr 2026Individual Open · Men1:09:27 PB98/1192Beat 92%
↑ 138 days after Utrecht 2025 2:30 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:49 faster on the clock, yet the race was 5:19 faster for everyone, so 2:30 was lost on the field.
The fieldCompare these two →5:19 faster This athlete2:49 faster -
Amsterdam21 Jan 2026Individual Pro · Men1:18:27 PB140/243Beat 42%
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Utrecht28 Nov 2025Doubles Open · Men1:09:54 PB231/879Beat 74%
↑ 274 days after Rotterdam 2025, with Ruben Van Der Sluiszen 0:29 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:09 faster on the clock looks better than it was: the race was 1:38 faster for everyone, which leaves this 0:29 behind the field.
The fieldCompare these two →1:38 faster This pair1:09 faster -
Utrecht28 Nov 2025Individual Open · Men1:12:1650/575Beat 91%
↑ 203 days after Heerenveen 2025 22:57 better than the field Why ↓Close ↑
23:04 faster on the clock, and the race was 0:07 faster for everyone, so 22:57 of it was this athlete.
The fieldCompare these two →0:07 faster This athlete23:04 faster -
Heerenveen9 May 2025Individual Open · Men1:35:20227/325Beat 30%
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Rotterdam27 Feb 2025Doubles Open · Men1:11:0398/335Beat 71%