Progress against the field
Jessica Zalzal has gained 29:36 on the field from Dallas 2024 to Boston 2026.
The clock says 36:43 faster, but the races themselves got 7:07 quicker for everyone.
The longest gap between two races compared here, 307 days between Dallas 2024 and Boston 2025, still ended 35:50 ahead of 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.
Every race
5 races · 5 events
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Boston8 Oct 2026Individual Open · Women1:47:04291/452Beat 36%
↑ 230 days after Las Vegas 2026 0:00 better than the field Why ↓Close ↑
2:32 faster on the clock, and the race was 2:32 faster for everyone. Whatever changed, it changed for all of them.
The fieldCompare these two →2:32 faster This athlete2:32 faster -
Las Vegas20 Feb 2026Individual Open · Women1:49:361262/1796Beat 30%
↑ 147 days after Boston 2025 6:14 worse than the field Why ↓Close ↑
5:21 slower on the clock in a race that was 0:53 faster for everyone: 6:14 lost to the field.
The fieldCompare these two →0:53 faster This athlete5:21 slower -
Boston26 Sep 2025Individual Open · Women1:44:15 PB855/1290Beat 34%
↑ 307 days after Dallas 2024 35:50 better than the field Why ↓Close ↑
35:50 better than the field: 39:32 faster on the clock, against 3:42 faster for everyone.
The fieldCompare these two →3:42 faster This athlete39:32 faster -
Dallas23 Nov 2024Individual Open · Women2:23:47597/620Beat 4%
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Washington D.C. Open North American ChampionshipsDate unknownIndividual Open · Women1:46:57682/893Beat 24%