Progress against the field
Between Rotterdam 2025 and Heerenveen 2026, Gelske Rozema and Thea Buith pulled 1:22 ahead of the field.
Over the same races everyone got 7:39 quicker, so 9:01 faster on the clock looks better than it was.
203 days between Heerenveen 2025 and Utrecht 2025 is the longest gap compared here, and the second race was 6:15 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. The summary above covers Doubles Open · Women, with Thea Buith, the one raced most; every comparison is in the list below.
Every race
7 races · 6 events
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Heerenveen14 May 2026Doubles Open · Women1:29:41 PB435/737Beat 41%
↑ 167 days after Utrecht 2025, with Thea Buith 2:25 better than the field Why ↓Close ↑
6:25 faster on the clock, and the race was 4:00 faster for everyone, so 2:25 of it was this pair.
The fieldCompare these two →4:00 faster This pair6:25 faster -
Utrecht28 Nov 2025Doubles Open · Women1:36:06209/294Beat 29%
↑ 203 days after Heerenveen 2025, with Thea Buith 6:15 worse than the field Why ↓Close ↑
6:15 behind the field: 5:03 slower on the clock, against 1:12 faster for everyone.
The fieldCompare these two →1:12 faster This pair5:03 slower -
Heerenveen9 May 2025Doubles Open · Women1:31:03211/292Beat 28%
↑ 71 days after Rotterdam 2025, with Thea Buith 5:12 better than the field Why ↓Close ↑
7:39 faster on the clock, and the race was 2:27 faster for everyone, so 5:12 of it was this pair.
The fieldCompare these two →2:27 faster This pair7:39 faster -
Heerenveen9 May 2025Relay · Women1:39:1239/42Beat 7%
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Rotterdam27 Feb 2025Doubles Open · Women1:38:42524/633Beat 17%
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Rotterdam6 Apr 2024Doubles Open · Women1:46:11498/564Beat 12%
↑ 154 days after Amsterdam 2023, with Ingrid De Jong 6:02 worse than the field Why ↓Close ↑
4:11 slower on the clock in a race that was 1:51 faster for everyone: 6:02 lost to the field.
The fieldCompare these two →1:51 faster This pair4:11 slower -
Amsterdam4 Nov 2023Doubles Open · Women1:42:00272/319Beat 15%