Joao Fonseca might only be 19 years old, but greatness has seemingly been expected of him for a couple of years already. Sometimes, being patient in tennis and letting a career grow naturally is difficult. Still, the Brazilian has the skillset to promise he could be special.
That was the case in the first set of his first-round match against Canadian Gabriel Diallo at the Monte Carlo Masters. Not only was Fonseca, currently ranked No. 40, capable of so much more, hitting shots with bombast, but his opponent was helping beat himself, too.
Diallo had 16 unforced errors and just seven winners in the opening set, while the Brazilian played brutally efficient tennis by having six winners but just four unforced errors. The Canadian added three double faults as well. All of which resulted in Fonseca taking set one relatively easily, 6-2.
Joao Fonseca defeats Gabriel Diallo in the first round of the 2026 Monte Carlo Masters
The second set didn't start as well as he would have hoped. Diallo raised his form, knowing he must if he had any chance of not leaving Monte Carlo early. He got a break of the Brazilian and jumped out to a 3-1 lead. While trying to keep consolidating the early break, though, he was broken partly because Fonseca hit an outrageous cross-court winner to get to 15-40 that helped lead to a break.
It was the kind of shot that flashed everything Joao Fonseca could be as he evolves his game and gets stronger. He still needs to work on his court coverage, but when he does get to a ball, he can instantly change the narrative of a point from defensive to offensive. He can be elite.
As with every young player, inconsistency is likely. Even Jannik Sinner dealt with some ebbs and flows early in his career. He learned from his losses, gained leg strength to give him more power and speed (which Fonseca will need to do), and then became a generational talent.
Can the Brazilian do the same? That is a lot of pressure to put on a player, but he already has two tour wins and will get a bunch more. He will need to get more consistent, especially with power, but he has the ability to do so.
Diallo learned that, too. After Fonseca was down 1-3, he rushed back to lead 4-3 after another break. After a hold and another break, he had suddenly won five straight games to take set two 6-2.
Joao Fonseca will next face Arthur Rinderknech in the second round of the Monte Carlo Masters. He is a frustrating player to face for many players, and the match could be another learning experience for the young Brazilian.