Progress against the field
Between London 2025 and London Excel 2025, Karen Marsh pulled 1:04 ahead of the field.
The clock says 4:31 faster, but the races themselves got 3:27 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 · Women, the one raced most; every comparison is in the list below.
Every race
5 races · 5 events
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London Excel4 Dec 2025Individual Open · Women1:28:32 PB720/1542Beat 53%
↑ 215 days after London 2025 1:04 better than the field Why ↓Close ↑
4:31 faster on the clock, and the race was 3:27 faster for everyone, so 1:04 of it was this athlete.
The fieldCompare these two →3:27 faster This athlete4:31 faster -
London3 May 2025Individual Open · Women1:33:03749/1368Beat 45%
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Birmingham25 Oct 2024Doubles Open · Women1:22:51 PB146/397Beat 63%
↑ 370 days after Birmingham 2023, with Hannah Sargeant 3:31 better than the field Why ↓Close ↑
5:39 faster on the clock, and the race was 2:08 faster for everyone, so 3:31 of it was this pair.
The fieldCompare these two →2:08 faster This pair5:39 faster -
Birmingham21 Oct 2023Doubles Open · Women1:28:30292/460Beat 37%
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Birmingham15 Oct 2022Relay · Mixed1:21:0816/50Beat 68%