João Fonseca (tennis)

João Franca Guimarães Fonseca (Portuguese pronunciation:; born 21 August 2006) is a Brazilian professional tennis player. He has a career-high ATP singles ranking of world No. 24 achieved on 3 November 2025 and a doubles ranking of No. 102, reached on 20 July 2026. He is the current No. 1 singles player from Brazil.

Fonseca has won two ATP Tour singles titles and one doubles title. He is also the 2024 NextGen Finals champion.