Progress against the field
From Amsterdam 2024 to Amsterdam 2026, Tamara van Bemmel and Lieke Groen got 4:10 faster than the field.
Over the same races everyone got 8:42 quicker, so 12:52 faster on the clock looks better than it was.
328 days between Rotterdam 2025 and Amsterdam 2026 is the longest gap compared here, and the second race was 5:43 better than 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. The summary above covers Doubles Open · Women, with Lieke Groen, the one raced most; every comparison is in the list below.
Every race
7 races · 6 events
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Rotterdam15 Apr 2026Relay · Women1:24:0641/84Beat 51%
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Rotterdam15 Apr 2026Doubles Open · Mixed1:08:49 PB54/544Beat 90%
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Amsterdam21 Jan 2026Doubles Open · Women1:15:59 PB177/1030Beat 83%
↑ 328 days after Rotterdam 2025, with Lieke Groen 5:43 better than the field Why ↓Close ↑
10:47 faster on the clock, and the race was 5:04 faster for everyone, so 5:43 of it was this pair.
The fieldCompare these two →5:04 faster This pair10:47 faster -
Utrecht28 Nov 2025Individual Open · Women1:29:00 PB72/254Beat 72%
↑ 203 days after Heerenveen 2025 0:06 better than the field Why ↓Close ↑
2:05 faster on the clock, and the race was 1:59 faster for everyone. Whatever changed, it changed for all of them.
The fieldCompare these two →1:59 faster This athlete2:05 faster -
Heerenveen9 May 2025Individual Open · Women1:31:05205/571Beat 64%
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Rotterdam27 Feb 2025Doubles Open · Women1:26:46150/272Beat 45%
↑ 140 days after Amsterdam 2024, with Lieke Groen 1:33 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:05 faster on the clock looks better than it was: the race was 3:38 faster for everyone, which leaves this 1:33 behind the field.
The fieldCompare these two →3:38 faster This pair2:05 faster -
Amsterdam10 Oct 2024Doubles Open · Women1:28:51357/657Beat 46%