Who is Joao Fonseca? 18-year-old Brazilian wonderkid stuns Andrey Rublev at Australian Open - The qualifier defeated World No 9 Rublev on his grand slam debut to extend his winning run to 14 matches

Fonseca was part of the 2024 lineup alongside Fils and Luca Van Assche of France; Michelsen, eventual finalist Learner Tien and Nishesh Basavareddy of the U.S.; Jakub Mensik of the Czech Republic and Shang Juncheng of China, who also goes by his Americanized name, Jerry Shang.

At just 18, João Fonseca is putting the tennis world on notice, as illustrated by his clinical straight-sets victory over ninth seed Andrey Rublev at the Australian Open.

Grand Slam giant killings do not come much more sizeable than Joao Fonseca's stunning straight sets victory over Andrey Rublev at the Australian Open.

Fonseca has long looked like a star-in-waiting. Under pressure in his first Grand Slam set, he delivered beyond those lofty expectations

Rising Brazilian tennis star Joao Fonseca has made a stunning debut on the Grand Slam circuit, defeating Andrey Rublev at the 2025 Australian Open. This is Rublev's first opening-round defeat at Melbourne Park since 2019.

João Fonseca definitively introduced himself to the world as the latest teen sensation in men's tennis on Tuesday night, upsetting No. 9 seed Andrey Rublev 7-6 (1), 6-3, 7-6 (5) in the first round of the Australian Open.

Teenage sensation Joao Fonseca announced himself on the big stage by knocking out ninth seed Andrey Rublev in the first round of the Australian Open. The 18-year-old Brazilian is the hottest young property in men’s tennis after winning the Next Gen ATP Finals for the best players aged 21 and under last month and then qualifying for the main draw of a grand slam for the first time here.

Teenage sensation Joao Fonseca is set to reach a new rankings milestone - and he could be about to become a tennis millionaire.