Joao Fonseca definitively introduced himself to the world as the latest teen sensation in men’s tennis, upsetting No. 9 seed Andrey Rublev in the first round of 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

Joao Fonseca, the 18-year-old Brazilian qualifier, has taken Melbourne by storm with a remarkable upset over 9th seed Andrey Rublev at the Australian Open. He is also getting praise from both Novak Djokovic and Carlos Alcaraz.