Progress against the field
Between Belgium 2025 and Gent 2025, Jan-Willem Kalkman and Sander Kalkman pulled 1:19 ahead of the field.
The clock says 3:31 faster, but the races themselves got 2:12 quicker for everyone.
237 days between Belgium 2025 and Utrecht 2025 is the longest gap compared here, and the second race was 1:46 better than 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 · Men, with Sander Kalkman, the one raced most; every comparison is in the list below.
Every race
7 races · 7 events
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Rotterdam15 Apr 2026Individual Pro · Men1:24:28 PB196/348Beat 44%
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Amsterdam21 Jan 2026Doubles Pro · Men1:04:10 PB117/298Beat 61%
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Gent12 Dec 2025Doubles Open · Men1:00:04 PB51/1164Beat 96%
↑ 14 days after Utrecht 2025, with Sander Kalkman 0:27 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:41 faster on the clock, yet the race was 2:08 faster for everyone, so 0:27 was lost on the field.
The fieldCompare these two →2:08 faster This pair1:41 faster -
Utrecht28 Nov 2025Doubles Open · Men1:01:4553/879Beat 94%
↑ 237 days after Belgium 2025, with Sander Kalkman 1:46 better than the field Why ↓Close ↑
1:50 faster on the clock, and the race was 0:04 faster for everyone, so 1:46 of it was this pair.
The fieldCompare these two →0:04 faster This pair1:50 faster -
Maastricht19 Sep 2025Individual Open · Men1:17:27 PB242/1352Beat 82%
↑ 204 days after Rotterdam 2025 1:55 better than the field Why ↓Close ↑
2:15 faster on the clock, and the race was 0:20 faster for everyone, so 1:55 of it was this athlete.
The fieldCompare these two →0:20 faster This athlete2:15 faster -
Belgium5 Apr 2025Doubles Open · Men1:03:35104/898Beat 88%
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Rotterdam27 Feb 2025Individual Open · Men1:19:42386/1283Beat 70%