From another carnival atmosphere, this time on Court Simonne-Mathieu, Fonseca emerged to set up a meeting with Croatian youngster Dino Prizmic.
“First round is always difficult, much more pressure, and playing against a guy that already came from qualies, so he played three matches before," the world No.30 said. "He was putting a lot of pressure on me from the very beginning with his serve. I was a set point down (at 5-6 in the tie-break) and I played well.
“I think that set was really important for the match," he added. "Since I won the set, I think his energy went down a little bit, and I felt a little bit more good on the court, felt good with my shots.
“I started the game with one level, and then I ended the game with another level, so that's a positive thing. Just happy the way that I stayed positive."