Joao Fonseca reflects after breakthrough French Open run ends against Jakub Mensik

Brazilian teenage sensation Joao Fonseca said his run to the French Open quarter-finals had given him a clearer understanding of both his game and his physical limits, after his impressive campaign came to an end with a defeat by Jakub Mensik on Tuesday.

The 19-year-old was beaten 6-4, 6-3, 7-6(3) by the Czech player, but said reaching the last eight of a Grand Slam for the first time had exceeded his expectations, particularly after arriving in Paris with concerns over a recent injury.

"Coming from a little injury and not having any expectations for this tournament and doing a great run, this is a positive week," Fonseca told reporters.

"This tournament gives me more conviction and more confidence to keep going and for sure understanding a little bit more body and my limits."

Fonseca, who defeated Novak Djokovic and Casper Ruud in earlier rounds, said the fortnight had shown him how his body could cope with the physical demands of Grand Slam tennis and reinforced his belief that he was moving in the right direction.

"I never saw my limit yet, but I already know that I can be comfortable with my physique," he said.

"I think it's more comfortable with my game, the way that I'm playing, that my mentality is on the right path...Maybe it's the same Joao, but finding new stuff."

The Brazilian teenager was full of praise for 20-year-old Mensik, who produced an impressive performance under the closed roof on Court Philippe-Chatrier to reach his first Grand Slam semi-final.

Despite the defeat, Fonseca said he would head into the grass-court season full of confidence, encouraged by his strong showing in Paris.