Progress against the field
Stefan Grootkarzijn has gained 0:58 on the field from Heerenveen 2025 to Maastricht 2026.
Over the same races everyone got 8:09 quicker, so 9:07 faster on the clock looks better than it was.
The biggest step was Heerenveen 2025 → Maastricht 2025: 4:20 on the field in 133 days.
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.
Every race
9 races · 9 events
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Maastricht19 Sep 2026Individual Open · Men1:00:212/546Beat 100%
↑ 128 days after Heerenveen 2026 0:24 better than the field Slower on the clock, ahead of the field Why ↓Close ↑
1:02 slower on the clock, but the race was 1:26 slower for everyone, so this was 0:24 better than the field.
The fieldCompare these two →1:26 slower This athlete1:02 slower -
Berlin22 May 2026Doubles Open · Mixed1:21:07 PB528/953Beat 45%
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Heerenveen14 May 2026Individual Open · Men59:196/966Beat 99%
↑ 29 days after Rotterdam 2026 0:41 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:06 faster on the clock looks better than it was: the race was 1:47 faster for everyone, which leaves this 0:41 behind the field.
The fieldCompare these two →1:47 faster This athlete1:06 faster -
Rotterdam15 Apr 2026Individual Open · Men1:00:253/401Beat 99%
↑ 84 days after Amsterdam 2026 3:27 worse than the field Why ↓Close ↑
1:19 slower on the clock in a race that was 2:08 faster for everyone: 3:27 lost to the field.
The fieldCompare these two →2:08 faster This athlete1:19 slower -
Amsterdam21 Jan 2026Individual Open · Men59:06 PB7/1620Beat 100%
↑ 55 days after Madrid 2025 0:08 worse than the field Why ↓Close ↑
3:35 faster on the clock, and the race was 3:43 faster for everyone. Whatever changed, it changed for all of them.
The fieldCompare these two →3:43 faster This athlete3:35 faster -
Gent12 Dec 2025Doubles Open · Men55:34 PB9/1164Beat 99%
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Madrid27 Nov 2025Individual Open · Men1:02:4116/1312Beat 99%
↑ 69 days after Maastricht 2025 0:30 better than the field Why ↓Close ↑
0:30 better than the field: 4:09 faster on the clock, against 3:39 faster for everyone.
The fieldCompare these two →3:39 faster This athlete4:09 faster -
Maastricht19 Sep 2025Individual Open · Men1:06:5038/1352Beat 97%
↑ 133 days after Heerenveen 2025 4:20 better than the field Why ↓Close ↑
The race was 1:42 slower for everyone and the clock still says 2:38 faster: 4:20 gained on the field.
The fieldCompare these two →1:42 slower This athlete2:38 faster -
Heerenveen9 May 2025Individual Open · Men1:09:28103/1217Beat 92%