Teenager João Fonseca won his first ATP Tour title at the Argentina Open on Sunday, announcing himself as one of tennis’ brightest talents.

Brazilian 18-year-old Joao Fonseca defeated Argentine fifth seed Francisco Cerundolo 6-4, 7-6 (1) to win his first ATP Tour title at the IEB+ Argentina Open on Sunday in Buenos Aires.

Young sensation Joao Fonseca scripted history at the Buenos Aires Open, as he became the youngest-ever to win an ATP singles title from South America.

Alexander Zverev has given Joao Fonseca a harsh reality check after the teenager lifted his first ATP Tour trophy. The 18-year-old clinched his maiden title at the Argentina Open on Sunday night and admitted he had dreams of being world No. 1 and winning Grand Slams.

Joao Fonseca made history by winning his maiden ATP Tour title at the Argentina Open 2025, defeating local hero Francisco Cerundolo. The 18-year-old Brazilian became the youngest South American champion in ATP Tour history and the 10th youngest overall.

Teenager Joao Fonseca underlines why he is one of tennis' most promising stars by beating Francisco Cerundolo to claim his first ATP Tour title.

Joao Fonseca's rise in recent months has left fans and insiders speechless. The Brazilian ace's talent had already emerged during the Rio Open a year ago, when he reached the quarterfinals thanks to a series of incredible performances for such a young player.

Joao Fonseca described his week as "unbelievable" after becoming the youngest South American to win an ATP Tour singles title when he captured the trophy at the Buenos Aires Open.