Progress against the field
From Boston 2025 to Boston 2026, Shayreen Izoli got 2:22 faster than the field.
Over the same races everyone got 1:30 quicker, so 3:52 faster on the clock looks better than it was.
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
2 races · 2 events
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Boston8 Oct 2026Individual Open · Women1:43:19 PB251/452Beat 45%
↑ 377 days after Boston 2025 2:22 better than the field Why ↓Close ↑
3:52 faster on the clock, and the race was 1:30 faster for everyone, so 2:22 of it was this athlete.
The fieldCompare these two →1:30 faster This athlete3:52 faster -
Boston26 Sep 2025Individual Open · Women1:47:11934/1290Beat 28%