Progress against the field
Jasper Groen has dropped 12:36 behind the field from Rotterdam 2025 to Rotterdam 2026.
Over the same races everyone got 7:34 quicker, so 5:02 slower on the clock looks better than it was.
208 days between Maastricht 2025 and Rotterdam 2026 is the longest gap compared here, and the second race was 8:02 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
5 races · 3 events
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Rotterdam15 Apr 2026Individual Open · Men1:30:56343/556Beat 38%
↑ 208 days after Maastricht 2025 8:02 worse than the field Why ↓Close ↑
0:48 slower on the clock in a race that was 7:14 faster for everyone: 8:02 lost to the field.
The fieldCompare these two →7:14 faster This athlete0:48 slower -
Maastricht19 Sep 2025Doubles Open · Men1:07:27 PB196/821Beat 76%
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Maastricht19 Sep 2025Doubles Open · Men1:09:5988/354Beat 75%
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Maastricht19 Sep 2025Individual Open · Men1:30:08677/1352Beat 50%
↑ 204 days after Rotterdam 2025 4:34 worse than the field Why ↓Close ↑
4:14 slower on the clock in a race that was 0:20 faster for everyone: 4:34 lost to the field.
The fieldCompare these two →0:20 faster This athlete4:14 slower -
Rotterdam27 Feb 2025Individual Open · Men1:25:54 PB621/1283Beat 52%