At which 2013 event did Simone Biles make her senior international debut?

Simone Biles made her senior international debut at the 2013 American Cup.

The American Cup is a prestigious international all-around competition held in the United States. At the 2013 event in Worcester, Massachusetts, Biles competed against leading senior gymnasts and finished second in the all-around behind fellow American Katelyn Ohashi.

That result announced Biles as a major emerging talent. Later in 2013, she won the U.S. national all-around title and captured four gold medals at the World Championships in Antwerp, including the all-around title. She was only 16 years old during that breakthrough season.

The American Cup is often confused with the U.S. Classic, another important domestic meet that Biles competed in during her rise. The City of Jesolo Trophy and Pacific Rim Championships were also significant competitions, but they were not the event named as her senior international debut.