Progress against the field
Between Rotterdam 2025 and Heerenveen 2026, Marianne Koster lost 9:25 to the field.
The clock says 0:47 faster, but the races themselves got 10:12 quicker for everyone.
The longest gap between two races compared here, 188 days between Maastricht 2025 and Mechelen 2026, cost 6:45 on 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 Individual Open · Women, the one raced most; every comparison is in the list below.
Every race
33 races · 19 events
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Maastricht19 Sep 2026Doubles Open · Mixed1:03:3126/687Beat 96%
↑ 128 days after Heerenveen 2026, with Niels Goedbloed 0:44 better than the field Slower on the clock, ahead of the field Why ↓Close ↑
0:09 slower on the clock, but the race was 0:53 slower for everyone, so this was 0:44 better than the field.
The fieldCompare these two →0:53 slower This pair0:09 slower -
Maastricht19 Sep 2026Individual Pro · Women1:08:15 PB12/160Beat 93%
↑ 93 days after Stockholm 2026 2:56 better than the field Why ↓Close ↑
The race was 0:11 slower for everyone and the clock still says 2:45 faster: 2:56 gained on the field.
The fieldCompare these two →0:11 slower This athlete2:45 faster -
Stockholm18 Jun 2026Individual Pro · Women1:11:00274/751Beat 64%
↑ 64 days after Rotterdam 2026 1:44 worse than the field Why ↓Close ↑
2:12 slower on the clock in a race that was 0:28 slower for everyone: 1:44 lost to the field.
The fieldCompare these two →0:28 slower This athlete2:12 slower -
Heerenveen14 May 2026Doubles Open · Mixed1:03:22 PB40/808Beat 95%
↑ 113 days after Amsterdam 2026, with Niels Goedbloed 1:27 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:18 faster on the clock, yet the race was 1:45 faster for everyone, so 1:27 was lost on the field.
The fieldCompare these two →1:45 faster This pair0:18 faster -
Heerenveen14 May 2026Doubles Open · Women1:10:1226/513Beat 95%
↑ 153 days after Gent 2025, with Phylicia Janssen 3:38 worse than the field Why ↓Close ↑
3:38 behind the field: 0:36 slower on the clock, against 3:02 faster for everyone.
The fieldCompare these two →3:02 faster This pair0:36 slower -
Heerenveen14 May 2026Individual Open · Women1:05:28 PB1/608Beat 100%
↑ 49 days after Mechelen 2026 0:02 better than the field Why ↓Close ↑
0:58 faster on the clock, and the race was 0:56 faster for everyone. Whatever changed, it changed for all of them.
The fieldCompare these two →0:56 faster This athlete0:58 faster -
Rotterdam15 Apr 2026Doubles Pro · Women1:12:17 PB52/226Beat 77%
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Rotterdam15 Apr 2026Individual Pro · Women1:08:488/128Beat 94%
↑ 20 days after Mechelen 2026 1:16 better than the field Why ↓Close ↑
0:29 faster on the clock in a race that was 0:47 slower for everyone: 1:16 better than the field.
The fieldCompare these two →0:47 slower This athlete0:29 faster -
Mechelen26 Mar 2026Individual Open · Women1:06:266/776Beat 99%
↑ 188 days after Maastricht 2025 6:45 worse than the field Why ↓Close ↑
0:55 slower on the clock in a race that was 5:50 faster for everyone: 6:45 lost to the field.
The fieldCompare these two →5:50 faster This athlete0:55 slower -
Mechelen26 Mar 2026Individual Pro · Women1:09:1725/139Beat 82%
↑ 64 days after Amsterdam 2026 0:47 better than the field Why ↓Close ↑
0:47 better than the field: 0:55 faster on the clock, against 0:08 faster for everyone.
The fieldCompare these two →0:08 faster This athlete0:55 faster -
Amsterdam21 Jan 2026Doubles Open · Mixed1:03:4029/506Beat 94%
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Amsterdam21 Jan 2026Individual Pro · Women1:10:1214/128Beat 89%
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Gent12 Dec 2025Doubles Open · Women1:09:36 PB28/882Beat 97%
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Gent12 Dec 2025Individual Pro · Women1:09:204/114Beat 97%
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Verona5 Dec 2025Doubles Open · Mixed1:05:1053/1091Beat 95%
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Verona5 Dec 2025Individual Pro · Women1:10:4914/131Beat 89%
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Utrecht28 Nov 2025Individual Pro · Women1:09:452/67Beat 97%
↑ 70 days after Maastricht 2025 1:43 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:14 faster on the clock, yet the race was 3:57 faster for everyone, so 1:43 was lost on the field.
The fieldCompare these two →3:57 faster This athlete2:14 faster -
Maastricht19 Sep 2025Doubles Pro · Women1:14:4816/62Beat 74%
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Maastricht19 Sep 2025Individual Open · Women1:05:312/590Beat 100%
↑ 133 days after Heerenveen 2025 0:35 better than the field Why ↓Close ↑
0:35 better than the field: 1:39 faster on the clock, against 1:04 faster for everyone.
The fieldCompare these two →1:04 faster This athlete1:39 faster -
Maastricht19 Sep 2025Individual Pro · Women1:11:5914/109Beat 87%
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Heerenveen9 May 2025Individual Pro · Women1:12:4010/105Beat 91%
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Heerenveen9 May 2025Individual Open · Women1:07:102/571Beat 100%
↑ 71 days after Rotterdam 2025 3:17 worse than the field Why ↓Close ↑
3:17 behind the field: 0:55 slower on the clock, against 2:22 faster for everyone.
The fieldCompare these two →2:22 faster This athlete0:55 slower -
Belgium5 Apr 2025Doubles Open · Mixed1:04:4639/722Beat 95%
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Belgium5 Apr 2025Individual Pro · Women1:13:4710/77Beat 87%
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Rotterdam27 Feb 2025Doubles Open · Women1:26:30310/633Beat 51%
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Rotterdam27 Feb 2025Individual Open · Women1:06:151/506Beat 100%
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Stockholm7 Dec 2024Individual Open · Women1:10:1812/309Beat 96%
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Amsterdam10 Oct 2024Individual Pro · Women1:11:102/66Beat 97%
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Amsterdam10 Oct 2024Individual Open · Women1:07:264/678Beat 99%
↑ 187 days after Rotterdam 2024 0:24 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:18 faster on the clock looks better than it was: the race was 1:42 faster for everyone, which leaves this 0:24 behind the field.
The fieldCompare these two →1:42 faster This athlete1:18 faster -
Rotterdam6 Apr 2024Individual Open · Women1:08:449/585Beat 99%
↑ 77 days after Maastricht 2024 2:48 worse than the field Why ↓Close ↑
0:26 slower on the clock in a race that was 2:22 faster for everyone: 2:48 lost to the field.
The fieldCompare these two →2:22 faster This athlete0:26 slower -
Maastricht20 Jan 2024Individual Open · Women1:08:184/314Beat 99%
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World ChampionshipsDate unknownIndividual Pro · Women1:22:36421/470Beat 10%
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World Championships NiceDate unknownIndividual Pro · Women1:15:36169/677Beat 75%