The setting a new women's 50-mile world record with a time of 5:18:57. Tunnel Hill 50 Mile, held in Vienna, Illinois, continues to be a race where world records fall, and on November 8, 2025, it was Anne Flower Courtney Olsen held the previous record that she set when she ran 5:31:56 at Tunnel Hill just last year . Olsen raced the 100k event this year and received a mid-race 50-mile split of 5:33:59 as the second woman for the distance.