Progress against the field
Tim van Duin and Marleen Zijlstra have dropped 5:54 behind the field from Heerenveen 2025 to Heerenveen 2026.
Over the same races everyone got 6:47 quicker, so 0:53 faster on the clock looks better than it was.
The longest gap between two races compared here, 203 days between Heerenveen 2025 and Utrecht 2025, cost 4:33 on 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 · Mixed, with Marleen Zijlstra, the one raced most; every comparison is in the list below.
Every race
5 races · 5 events
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Heerenveen14 May 2026Doubles Open · Mixed1:10:45 PB149/808Beat 82%
↑ 167 days after Utrecht 2025, with Marleen Zijlstra 1:21 worse than the field Faster on the clock, behind the field Why ↓Close ↑
3:45 faster on the clock looks better than it was: the race was 5:06 faster for everyone, which leaves this 1:21 behind the field.
The fieldCompare these two →5:06 faster This pair3:45 faster -
Mechelen26 Mar 2026Individual Open · Men1:20:03 PB329/747Beat 56%
↑ 64 days after Amsterdam 2026 3:33 better than the field Why ↓Close ↑
3:33 better than the field: 5:57 faster on the clock, against 2:24 faster for everyone.
The fieldCompare these two →2:24 faster This athlete5:57 faster -
Amsterdam21 Jan 2026Individual Open · Men1:26:00274/570Beat 52%
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Utrecht28 Nov 2025Doubles Open · Mixed1:14:3063/381Beat 84%
↑ 203 days after Heerenveen 2025, with Marleen Zijlstra 4:33 worse than the field Why ↓Close ↑
2:52 slower on the clock in a race that was 1:41 faster for everyone: 4:33 lost to the field.
The fieldCompare these two →1:41 faster This pair2:52 slower -
Heerenveen9 May 2025Doubles Open · Mixed1:11:3846/250Beat 82%