Progress against the field
Between Amsterdam 2024 and Rotterdam 2026, Tonny van Elferen lost 1:53 to the field.
Over the same races everyone got 11:51 quicker, so 9:58 faster on the clock looks better than it was.
370 days between Cologne 2025 and Rotterdam 2026 is the longest gap compared here, and the second race was 1:11 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 · 5 events
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Rotterdam15 Apr 2026Individual Open · Men1:24:39 PB242/570Beat 58%
↑ 370 days after Cologne 2025 1:11 worse than the field Faster on the clock, behind the field Why ↓Close ↑
7:01 faster on the clock looks better than it was: the race was 8:12 faster for everyone, which leaves this 1:11 behind the field.
The fieldCompare these two →8:12 faster This athlete7:01 faster -
Cologne10 Apr 2025Individual Open · Men1:31:40793/1182Beat 33%
↑ 117 days after Frankfurt 2024 4:57 better than the field Why ↓Close ↑
7:55 faster on the clock, and the race was 2:58 faster for everyone, so 4:57 of it was this athlete.
The fieldCompare these two →2:58 faster This athlete7:55 faster -
Frankfurt14 Dec 2024Individual Open · Men1:39:351209/1480Beat 18%
↑ 65 days after Amsterdam 2024 5:39 worse than the field Why ↓Close ↑
4:58 slower on the clock in a race that was 0:41 faster for everyone: 5:39 lost to the field.
The fieldCompare these two →0:41 faster This athlete4:58 slower -
Amsterdam10 Oct 2024Individual Open · Men1:34:371104/1539Beat 28%
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St. GallenDate unknownIndividual Pro · Men1:45:17 PB174/191Beat 9%