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 Illinois Girls 1600m marks compared to their season’s best performances from 2025. Most Improved - 1600 Meter Run Comparing 2026 season to 2025 season Rank Improved Athlete/Team Class 2025 PR 2026 PR 1 -1:02.87 Jakayla Atkins East St. Louis (Sr.) 2028 7:13.30 6:10.43 2 -49.22 Mira Rich Centralia (H.S.) 2028 7:23.60 6:34.38 3 -45.69 Lilly Tucker New Athens 2027 6:29.24 5:43.55 4 -42.42 Gracie May Biziarek Wheaton-Warrenville South 2029 7:07.51 6:25.09 5 -40.91 Camila Ariza Highland Park 2028 7:09.90 6:28.99 6 -40.21 Sophia Johns...