The 19-year-old has shown signs of his big potential this year, with Fonseca winning the Argentina Open<\/a> back in February.<\/p>\n However, Fonseca<\/a> has been unable to show this sort of form at the US Open<\/a> this year after suffering an early exit.<\/p>\n Fonseca made his debut appearance in the main draw of the US Open this year, and picked up an impressive win in his first round match over Miomir Kecmanovic.<\/p>\n However, the Brazilian faced a step up in competition in the second round against 21st seed Tomas Machac<\/a>, which proved to be too much for Fonseca.<\/p>\n Fonseca was beaten by Machac, 7-6(4) 6-2 6-3, and shortly after his defeat he took to social media to reflect.<\/p>\n He wrote on Instagram, \u201cTough match today, with lessons and experiences I\u2019ll carry into the next matches. Thank you,\u00a0@usopen, and onward to more.\u201d<\/p>\n Joao Fonseca\u2019s Grand Slam Results in 2025<\/p>\n Fonseca has enjoyed a dramatic rise up the ATP<\/a> rankings in 2025, beginning the season ranked at world number 145 to now being exactly 100 places higher at world number 45.<\/p>\n This year has seen Fonseca make his main draw debut at all four major tournaments to varying degrees of success.<\/p>\n![\"Joao](\"https:\/\/www.newsbeep.com\/uk\/wp-content\/uploads\/2025\/08\/GettyImages-2232399265-1024x683.jpg\")
Photo by Elsa\/Getty ImagesJoao Fonseca posts message on Instagram after US Open loss<\/p>\n