Progress against the field
Between Amsterdam 2024 and Heerenveen 2026, Arinda Treffers and Joas Treffers pulled 0:36 ahead of the field.
Over the same races everyone got 8:22 quicker, so 8:58 faster on the clock looks better than it was.
The biggest step was Amsterdam 2024 → Rotterdam 2025: 5:22 on the field in 140 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
5 races · 4 events
-
Heerenveen14 May 2026Doubles Open · Mixed1:14:06133/461Beat 71%
↑ 167 days after Utrecht 2025, with Joas Treffers 5:10 worse than the field Why ↓Close ↑
0:04 slower on the clock in a race that was 5:06 faster for everyone: 5:10 lost to the field.
The fieldCompare these two →5:06 faster This pair0:04 slower -
Heerenveen14 May 2026Individual Open · Women1:22:42 PB104/608Beat 83%
-
Utrecht28 Nov 2025Doubles Open · Mixed1:14:02 PB124/701Beat 82%
↑ 274 days after Rotterdam 2025, with Joas Treffers 0:24 better than the field Why ↓Close ↑
0:24 better than the field: 0:30 faster on the clock, against 0:06 faster for everyone.
The fieldCompare these two →0:06 faster This pair0:30 faster -
Rotterdam27 Feb 2025Doubles Open · Mixed1:14:32155/707Beat 78%
↑ 140 days after Amsterdam 2024, with Joas Treffers 5:22 better than the field Why ↓Close ↑
5:22 better than the field: 8:32 faster on the clock, against 3:10 faster for everyone.
The fieldCompare these two →3:10 faster This pair8:32 faster -
Amsterdam10 Oct 2024Doubles Open · Mixed1:23:04354/618Beat 43%