Botswana won the third-fastest men's 4x400m in history at the World Relays, beating South Africa by one tenth. The U.S. ran the fastest relay leg in history, with South African Lythe Pillay running the fastest split in history. The only faster times in history were at the 1993 World Championships and the 2024 Olympics. The United States also placed third in the mixed 4x100m, securing one of six spots available at the new World Athletics Ultimate Championship in Budapest.