Progress against the field
Between Incheon 2025 and Osaka 2026, Yuji Arai lost 5:11 to the field.
The clock says 4:58 faster, but the races themselves got 10:09 quicker for everyone.
The longest gap between two races compared here, 216 days between Singapore 2025 and Osaka 2026, cost 3:01 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. The summary above covers Individual Open · Men, the one raced most; every comparison is in the list below.
Every race
6 races · 6 events
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Chiba6 Aug 2026Individual Pro · Men1:25:15144/295Beat 51%
↑ 362 days after Yokohama 2025 4:39 worse than the field Faster on the clock, behind the field Why ↓Close ↑
1:36 faster on the clock, yet the race was 6:15 faster for everyone, so 4:39 was lost on the field.
The fieldCompare these two →6:15 faster This athlete1:36 faster -
Osaka30 Jan 2026Individual Open · Men1:07:50 PB29/511Beat 94%
↑ 216 days after Singapore 2025 3:01 worse than the field Faster on the clock, behind the field Why ↓Close ↑
9:00 faster on the clock, yet the race was 12:01 faster for everyone, so 3:01 was lost on the field.
The fieldCompare these two →12:01 faster This athlete9:00 faster -
Yokohama9 Aug 2025Individual Pro · Men1:26:5189/228Beat 61%
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Hong Kong26 Jul 2025Individual Pro · Men1:21:29 PB63/166Beat 62%
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Singapore28 Jun 2025Individual Open · Men1:16:50127/1937Beat 93%
↑ 42 days after Incheon 2025 2:10 worse than the field Why ↓Close ↑
4:02 slower on the clock in a race that was 1:52 slower for everyone: 2:10 lost to the field.
The fieldCompare these two →1:52 slower This athlete4:02 slower -
Incheon17 May 2025Individual Open · Men1:12:4855/497Beat 89%