Progress against the field
Between Chicago Navy Pier 2024 and Boston 2025, Marcin Serafin lost 15:55 to the field.
Over the same races everyone got 5:22 quicker, so 10:33 slower on the clock looks better than it was.
The longest gap between two races compared here, 237 days between Las Vegas 2025 and Boston 2025, cost 15:09 on 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
4 races · 4 events
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Boston26 Sep 2025Individual Open · Men1:42:541113/1463Beat 24%
↑ 237 days after Las Vegas 2025 15:09 worse than the field Why ↓Close ↑
15:09 behind the field: 9:20 slower on the clock, against 5:49 faster for everyone.
The fieldCompare these two →5:49 faster This athlete9:20 slower -
New York30 May 2025Individual Pro · Men1:42:27 PB234/253Beat 8%
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Las Vegas1 Feb 2025Individual Open · Men1:33:34364/689Beat 47%
↑ 77 days after Chicago Navy Pier 2024 0:46 worse than the field Why ↓Close ↑
0:46 behind the field: 1:13 slower on the clock, against 0:27 slower for everyone.
The fieldCompare these two →0:27 slower This athlete1:13 slower -
Chicago Navy Pier16 Nov 2024Individual Open · Men1:32:21 PB493/814Beat 39%