Progress against the field
Rob Groenewold has gained 2:27 on the field from Rotterdam 2024 to Rotterdam 2026.
The clock says 13:09 faster, but the races themselves got 10:42 quicker for everyone.
412 days between Rotterdam 2025 and Rotterdam 2026 is the longest gap compared here, and the second race was 4:49 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.
Every race
5 races · 5 events
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Heerenveen14 May 2026Individual Pro · Men1:13:18 PB152/454Beat 67%
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Rotterdam15 Apr 2026Individual Open · Men1:10:28 PB60/556Beat 89%
↑ 412 days after Rotterdam 2025 4:49 better than the field Why ↓Close ↑
4:49 better than the field: 8:57 faster on the clock, against 4:08 faster for everyone.
The fieldCompare these two →4:08 faster This athlete8:57 faster -
Amsterdam21 Jan 2026Doubles Open · Mixed1:20:26 PB646/1206Beat 46%
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Rotterdam27 Feb 2025Individual Open · Men1:19:25374/1283Beat 71%
↑ 327 days after Rotterdam 2024 2:22 worse than the field Faster on the clock, behind the field Why ↓Close ↑
4:12 faster on the clock looks better than it was: the race was 6:34 faster for everyone, which leaves this 2:22 behind the field.
The fieldCompare these two →6:34 faster This athlete4:12 faster -
Rotterdam6 Apr 2024Individual Open · Men1:23:37364/1380Beat 74%