MileSplit Staff May 01, 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 Arkansas Girls 300m Hurdles marks compared to their season’s best performances from 2025. Most Improved - 300 Meter Hurdles Comparing 2026 season to 2025 season Rank Improved Athlete/Team Class 2025 PR 2026 PR 1 -17.52 Lailani Grant Monticello High School 2027 1:11.69 54.17 2 -17.13 McKinlee White Murfreesboro High School 2028 1:41.23 1:24.10 3 -11.82 Chaffin MacKenzie Pea Ridge High School 2027 1:10.19 58.36 4 -11.25 Ivy Cannon Quitman High School 2030 1:09.72 58.47 5 -9.79 Serenity Haney Nashville High School 2026 1:05.79 56.00 6 -9.77 ...