Progress against the field
Between Paris 2024 and Barcelona 2025, Fiona O’Brien kept pace with the field.
The clock says 3:42 faster, but the races themselves got 3:56 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
4 races · 4 events
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Dublin12 Nov 2025Doubles Open · Women1:20:54 PB306/719Beat 57%
↑ 21 days after Birmingham 2025, with Sandra Byrne 2:31 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:07 faster on the clock, yet the race was 2:38 faster for everyone, so 2:31 was lost on the field.
The fieldCompare these two →2:38 faster This pair0:07 faster -
Birmingham22 Oct 2025Doubles Open · Women1:21:01381/1111Beat 66%
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Barcelona25 Apr 2025Individual Open · Women2:06:09 PB584/613Beat 5%
↑ 167 days after Paris 2024 0:14 worse than the field Faster on the clock, behind the field Why ↓Close ↑
3:42 faster on the clock, yet the race was 3:56 faster for everyone, so 0:14 was lost on the field.
The fieldCompare these two →3:56 faster This athlete3:42 faster -
Paris9 Nov 2024Individual Open · Women2:09:51711/747Beat 5%