Progress against the field
Between Rotterdam 2026 and Heerenveen 2026, Boris van de Giessen lost 4:21 to the field.
The clock says 2:34 slower, but the races themselves got 1:47 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 Individual Open · Men, the one raced most; every comparison is in the list below.
Every race
5 races · 5 events
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Heerenveen14 May 2026Individual Open · Men1:04:2439/966Beat 96%
↑ 29 days after Rotterdam 2026 4:21 worse than the field Why ↓Close ↑
4:21 behind the field: 2:34 slower on the clock, against 1:47 faster for everyone.
The fieldCompare these two →1:47 faster This athlete2:34 slower -
Rotterdam15 Apr 2026Individual Open · Men1:01:50 PB14/1192Beat 99%
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Mechelen26 Mar 2026Doubles Open · Men59:25 PB35/593Beat 94%
↑ 104 days after Gent 2025, with Daniel Rijlaarsdam 0:01 worse than the field Why ↓Close ↑
Moved with the field: 2:59 faster on the clock, against 3:00 faster for everyone.
The fieldCompare these two →3:00 faster This pair2:59 faster -
Gent12 Dec 2025Doubles Open · Men1:02:2497/1164Beat 92%
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Utrecht28 Nov 2025Doubles Open · Men1:12:48133/461Beat 71%