Progress against the field
Between Rotterdam 2025 and Rotterdam 2026, Hilco De Lathouder and Roy Koolloos lost 3:35 to the field.
The clock says 0:34 faster, but the races themselves got 4:09 quicker for everyone.
328 days between Rotterdam 2025 and Amsterdam 2026 is the longest gap compared here, and the second race was 1:10 behind 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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Rotterdam15 Apr 2026Doubles Open · Men1:07:1085/580Beat 85%
↑ 84 days after Amsterdam 2026, with Roy Koolloos 2:25 worse than the field Why ↓Close ↑
2:30 slower on the clock in a race that was 0:05 slower for everyone: 2:25 lost to the field.
The fieldCompare these two →0:05 slower This pair2:30 slower -
Amsterdam21 Jan 2026Doubles Open · Men1:04:40 PB171/994Beat 83%
↑ 328 days after Rotterdam 2025, with Roy Koolloos 1:10 worse than the field Faster on the clock, behind the field Why ↓Close ↑
3:04 faster on the clock, yet the race was 4:14 faster for everyone, so 1:10 was lost on the field.
The fieldCompare these two →4:14 faster This pair3:04 faster -
Rotterdam27 Feb 2025Doubles Open · Men1:07:4462/316Beat 80%
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Amsterdam10 Oct 2024Individual Open · Men1:22:26 PB610/1539Beat 60%