Progress against the field
Between Johannesburg I 2025 and Johannesburg 2026, Iain Marsden pulled 10:49 ahead of the field.
The clock says 22:44 faster, but the races themselves got 11:55 quicker for everyone.
The biggest step was Johannesburg I 2025 → Cape Town 2025: 10:03 on the field in 140 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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Johannesburg30 May 2026Individual Open · Men1:48:44 PB466/740Beat 37%
↑ 315 days after Cape Town 2025 0:46 better than the field Why ↓Close ↑
0:46 better than the field: 1:52 faster on the clock, against 1:06 faster for everyone.
The fieldCompare these two →1:06 faster This athlete1:52 faster -
Johannesburg29 Nov 2025Doubles Open · Men1:26:03 PB193/439Beat 56%
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Cape Town19 Jul 2025Individual Open · Men1:50:36572/781Beat 27%
↑ 140 days after Johannesburg I 2025 10:03 better than the field Why ↓Close ↑
20:52 faster on the clock, and the race was 10:49 faster for everyone, so 10:03 of it was this athlete.
The fieldCompare these two →10:49 faster This athlete20:52 faster -
Johannesburg I1 Mar 2025Individual Open · Men2:11:28373/422Beat 12%