Progress against the field
Between Amsterdam 2026 and Rotterdam 2026, Iris de Jong and Thom de Groen lost 3:43 to the field.
Over the same races everyone got 0:50 quicker, so 2:53 slower on the clock looks better than it was.
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 2026Doubles Open · Mixed1:13:07193/1047Beat 82%
↑ 84 days after Amsterdam 2026, with Thom de Groen 3:43 worse than the field Why ↓Close ↑
2:53 slower on the clock in a race that was 0:50 faster for everyone: 3:43 lost to the field.
The fieldCompare these two →0:50 faster This pair2:53 slower -
Mechelen26 Mar 2026Doubles Open · Women1:16:49 PB67/285Beat 77%
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Amsterdam21 Jan 2026Doubles Open · Mixed1:10:14 PB88/496Beat 82%
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London Excel4 Dec 2025Doubles Open · Mixed1:17:30592/1372Beat 57%
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Utrecht28 Nov 2025Doubles Open · Mixed1:29:04251/381Beat 34%