Most Improved Illinois Boys 400m Marks Compared to 2025

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Improvement Rankings: Top Illinois Boys 400m marks compared to their season’s best performances from 2025.

Most Improved - 400 Meter Dash

Comparing 2026 season to 2025 season

Rank Improved Athlete/Team Class 2025 PR 2026 PR
1 -29.79 2027 1:30.04 1:00.25
2 -19.98 2028 1:25.57 1:05.59
3 -16.44 2026 1:14.03 57.59
4 -16.20 2027 1:20.67 1:04.47
5 -15.04 2028 1:10.22 55.18
6 -11.53 ...