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.
It was quite a debut in the main draw of a Grand Slam tournament for the 18-year-old Brazilian, who is currently ranked 112th and made it into the bracket at Melbourne Park by winning three matches in qualifying rounds last week.
