MileSplit Staff Apr 24, 2026 PRO See the rest of this article Access the complete article with MileSplit PRO. Subscribe to keep reading Already a subscriber? Log in. Improvement Rankings: Top Oklahoma 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 -20.34 Eric Enzenauer Oklahoma School for the Blind 2030 1:50.70 1:30.36 2 -20.20 Victor Silveyra Santa Fe South High School 2030 1:30.42 1:10.22 3 -17.66 Isaiah Hayden Destiny Christian School 2028 1:14.16 56.50 4 -16.10 Kolbe Reavis Cache High School 2030 1:26.56 1:10.46 5 -14.06 Trevyr Covey Spiro Middle School 2031 1:26.78 1:12.72 6 -13.46 ...