2024: Maiden Challenger title Cassone won his maiden
ATP Challenger singles title at the
2024 Calgary National Bank Challenger. The following week he reached the semifinals at the
2024 Sioux Falls Challenger using a special exempt.
2025: ATP Tour and top 200 debuts In July, Cassone made his
ATP Tour debut as a qualifier at the
Washington Open. He lost to
Reilly Opelka in the first round. In November, Cassone reached his second
Challenger final at the
Champaign Challenger, losing to
Stefan Kozlov in the final. ==Performance timeline==