One of his likely rivals in the near future also spoke about Fonseca’s title in Buenos Aires. “Impressive, Joao,” Carlos Alcaraz, the 21-year-old, four-time major champion, posted X.

Joao Fonseca of Brazil with the trophy after his men's singles final win over Francisco Cerundolo at IEB+ Argentina Open 2025. / IMAGO / NurPhoto Tennis fans who do not yet know much about Joao ...