Progress against the field
Between Amsterdam 2026 and Heerenveen 2026, Bart Heemskerk and Marleen Heemskerk lost 1:35 to the field.
The clock says 0:10 faster, but the races themselves got 1:45 quicker for everyone.
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 Heemskerk, the one raced most; every comparison is in the list below.
Every race
4 races · 4 events
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Heerenveen14 May 2026Doubles Open · Mixed1:09:23 PB67/461Beat 86%
↑ 113 days after Amsterdam 2026, with Marleen Heemskerk 1:35 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:10 faster on the clock looks better than it was: the race was 1:45 faster for everyone, which leaves this 1:35 behind the field.
The fieldCompare these two →1:45 faster This pair0:10 faster -
Amsterdam21 Jan 2026Doubles Open · Mixed1:09:3378/496Beat 84%
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Rotterdam27 Feb 2025Doubles Open · Men1:05:27 PB73/733Beat 90%
↑ 140 days after Amsterdam 2024, with Wouter Graatsma 0:22 better than the field Why ↓Close ↑
2:53 faster on the clock, and the race was 2:31 faster for everyone, so 0:22 of it was this pair.
The fieldCompare these two →2:31 faster This pair2:53 faster -
Amsterdam10 Oct 2024Doubles Open · Men1:08:20169/855Beat 80%