Progress against the field
Joep Korstanje has dropped 1:07:28 behind the field from Rotterdam 2025 to Rotterdam 2026.
Over the same races everyone got 6:31 quicker, so 1:00:57 slower on the clock looks better than it was.
The longest gap between two races compared here, 328 days between Rotterdam 2025 and Amsterdam 2026, still ended 1:02 ahead of 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 2026Individual Open · Men2:43:19553/556Beat 1%
↑ 84 days after Amsterdam 2026 1:08:30 worse than the field Why ↓Close ↑
1:08:30 behind the field: 1:06:22 slower on the clock, against 2:08 faster for everyone.
The fieldCompare these two →2:08 faster This athlete1:06:22 slower -
Amsterdam21 Jan 2026Individual Open · Men1:36:57 PB1312/1620Beat 19%
↑ 328 days after Rotterdam 2025 1:02 better than the field Why ↓Close ↑
1:02 better than the field: 5:25 faster on the clock, against 4:23 faster for everyone.
The fieldCompare these two →4:23 faster This athlete5:25 faster -
Belgium5 Apr 2025Doubles Open · Men1:11:42 PB355/898Beat 61%
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Rotterdam27 Feb 2025Individual Open · Men1:42:22517/600Beat 14%