The United States dominated the opening day of the Pan American Games in Chile, winning nine gold medals and securing the top spot on the medal chart. Paige Madden, an Olympic swimmer from Alabama, set a new record in the 400-meter freestyle event, clinching a gold medal for the US. Other notable performances included Canada's Maggie Mac Neil winning gold in the relay and Mexico's Gabriela Agúndez and Alejandra Orozco taking the top two spots in diving.
