Progress against the field
Between Amsterdam 2026 and Heerenveen 2026, Marleen Heemskerk and Bart Heemskerk lost 1:35 to the field.
Over the same races everyone got 1:45 quicker, so 0:10 faster 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. The summary above covers Doubles Open · Mixed, with Bart Heemskerk, the one raced most; every comparison is in the list below.
Every race
5 races · 5 events
-
Heerenveen14 May 2026Doubles Open · Mixed1:09:23 PB67/461Beat 86%
↑ 113 days after Amsterdam 2026, with Bart 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%
-
Heerenveen9 May 2025Doubles Pro · Women1:16:08 PB23/69Beat 67%
-
Amsterdam10 Oct 2024Doubles Open · Women1:15:3533/308Beat 89%
↑ 341 days after Amsterdam 2023, with Margriet De Graaf 5:55 worse than the field Why ↓Close ↑
1:50 slower on the clock in a race that was 4:05 faster for everyone: 5:55 lost to the field.
The fieldCompare these two →4:05 faster This pair1:50 slower -
Amsterdam4 Nov 2023Doubles Open · Women1:13:45 PB29/319Beat 91%