MileSplit Staff Apr 10, 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 South Carolina 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 -19.47 Stephen Jefferson Ashley Ridge 2026 1:21.30 1:01.83 2 -18.84 Montrell Session Scott's Branch 2026 1:11.15 52.31 3 -17.30 Je'sean Porcher Mauldin 2028 1:18.04 1:00.74 4 -14.96 Phoenix Ciasulli Travelers Rest 2028 1:15.45 1:00.49 5 -14.19 Jkobi Balleger Greer 2027 1:08.89 54.70 6 -14.00 Adrian Clarkson North Cent...