is an Italian professional tennis player. He has a career-high in the ATP Rankings in singles of World No. 15 by the Association of Tennis Professionals (ATP) and in doubles of World No. 153 achieved on 9 August 2021. At the 2020 French Open, he became the youngest quarterfinalist in the men's singles event since Novak Djokovic in 2006. He has won three ATP titles in singles and one in doubles, and became the youngest ATP title-holder since 2008 by winning the 2020 Sofia Open. He was also the youngest ATP 500 champion since the category was created in 2009 by winning the 2021 Citi Open in Washington, D.C. and becoming the first teen to lift a trophy at this level.