MileSplit Staff Apr 17, 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 Missouri 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 -28.69 Trent Putman Branson High School 2028 1:48.59 1:19.90 2 -11.78 Parker Jensen Valley Park High School 2027 1:54.02 1:42.24 3 -11.72 Jamison Wilmesherr North Point High School 2027 1:10.69 58.97 4 -11.52 John Gertz Paris High School 2028 1:14.45 1:02.93 5 -11.34 Travon Donelson Ruskin High School 2028 1:14.36 1:03.02 6 -11.27