Teenage tennis sensation João Fonseca frustrated his home fans at the Rio Open in a first-round loss two days after winning his first ATP title.

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

Rising tennis star João Fonseca finished “an unbelievable week” with a straight sets victory over Francisco Cerúndolo in the Argentina Open final on Sunday to claim his first tour-level title. The 18-year-old Brazilian,

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.

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.

Regardless of ranking and seedings, the story of this year’s Golden Swing is Joao Fonseca. He would have been the main narrative even if he was losing, but the Brazilian clinched his maiden ATP Tour title.