Progress against the field
Between Birmingham 2025 and Cardiff 2026, Darren Williams and Harley Kozluk kept pace with the field.
The clock says 2:23 faster, but the races themselves got 2:09 quicker for everyone.
The largest gain on the field came from Birmingham 2025 → London Excel 2025: 7:22 in 43 days.
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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Cardiff29 Apr 2026Doubles Open · Men1:18:53215/271Beat 21%
↑ 146 days after London Excel 2025, with Harley Kozluk 7:08 worse than the field Why ↓Close ↑
7:08 behind the field: 6:50 slower on the clock, against 0:18 faster for everyone.
The fieldCompare these two →0:18 faster This pair6:50 slower -
London Excel4 Dec 2025Doubles Open · Men1:12:03 PB950/1815Beat 48%
↑ 43 days after Birmingham 2025, with Harley Kozluk 7:22 better than the field Why ↓Close ↑
9:13 faster on the clock, and the race was 1:51 faster for everyone, so 7:22 of it was this pair.
The fieldCompare these two →1:51 faster This pair9:13 faster -
Birmingham22 Oct 2025Doubles Open · Men1:21:16865/1099Beat 21%
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Glasgow2 Mar 2024Doubles Open · Men1:21:11606/787Beat 23%