Progress against the field
Between Boston 2025 and Boston 2026, Jim Chung pulled 23:01 ahead of the field.
The clock says 28:34 faster, but the races themselves got 5:33 quicker for everyone.
The longest gap between two races compared here, 230 days between Las Vegas 2026 and Boston 2026, still ended 9:27 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
3 races · 3 events
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Boston8 Oct 2026Individual Open · Men1:36:57 PB149/250Beat 40%
↑ 230 days after Las Vegas 2026 9:27 better than the field Why ↓Close ↑
11:58 faster on the clock, and the race was 2:31 faster for everyone, so 9:27 of it was this athlete.
The fieldCompare these two →2:31 faster This athlete11:58 faster -
Las Vegas20 Feb 2026Individual Open · Men1:48:551368/1739Beat 21%
↑ 147 days after Boston 2025 13:34 better than the field Why ↓Close ↑
16:36 faster on the clock, and the race was 3:02 faster for everyone, so 13:34 of it was this athlete.
The fieldCompare these two →3:02 faster This athlete16:36 faster -
Boston26 Sep 2025Individual Open · Men2:05:311372/1463Beat 6%