Progress against the field
Between Boston 2025 and New York 2026, Sarah O'Brien pulled 17:21 ahead of the field.
The clock says 16:48 faster, but the races themselves got 0:33 slower 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.
Every race
3 races · 3 events
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New York28 May 2026Individual Open · Women1:27:45118/586Beat 80%
↑ 244 days after Boston 2025 17:21 better than the field Why ↓Close ↑
16:48 faster on the clock in a race that was 0:33 slower for everyone: 17:21 better than the field.
The fieldCompare these two →0:33 slower This athlete16:48 faster -
Boston26 Sep 2025Individual Open · Women1:44:33862/1290Beat 33%
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Washington - North American Championships2 Mar 2024Individual Open · Women1:16:32 PB41/271Beat 85%