# Fonseca withdraws from US Open due to abdominal injury > Live situation record from CLSTR: https://clstr.news/situations/joo-fonseca-2026-tennis-season > Updated: 2026-08-31T14:21:03.000Z. Sources: 160. Developments: 11. Following his run in Montreal, where he secured a spot in the round of 16 by defeating Casper Ruud, Fonseca began competing in the 2026 Cincinnati Masters 1000. On 16 August, the 19-year-old Brazilian advanced to the third round by defeating Botic van de Zandschulp, matching Gustavo Kuerten’s achievement of ten wins in a single Masters 1000 season. However, Fonseca subsequently withdrew from Cincinnati after reporting abdominal pain during training. While he initially focused on rehabilitation in Rio de Janeiro to prepare for the US Open, his participation in the Grand Slam remained unconfirmed as he celebrated his 20th birthday on 21 August. On 24 August, Fonseca officially withdrew from the US Open. Now ranked 26th in the world, he stated that after medical examinations and the commencement of treatment, it became clear to him and his team that he “requires more time to recover fully to compete at a high level”. This withdrawal marks the only Grand Slam tournament he will miss in 2026, following a strong season that included a quarterfinal run at Roland Garros, where he defeated Novak Djokovic. This abdominal injury marks the fifth time this season that Fonseca has been sidelined by physical issues, following previous problems with his lower back, wrist, and shoulder. His absence is expected to impact his ATP ranking, as he is projected to lose 50 points from his 2025 performance. Regarding his recovery, the Brazilian Tennis Confederation (CBT) has announced that Fonseca has joined the squad for the upcoming Davis Cup tie against Switzerland. Team captain Jaime Oncins confirmed Fonseca’s availability for the September 18–19 confrontation in Rio de Janeiro, noting that his presence provides a significant boost to the team. ## Claims - João Fonseca was seeded 22 and receives a bye into the second round of the 2026 National Bank Open in Montreal. (disputed by 5 sources) - He entered Montreal as the 24th seed, reflecting his ATP ranking of 27. (disputed by 2 sources) - João Fonseca defeated Casper Ruud in the third round of the 2026 National Bank Open in Montreal. (corroborated by 14 sources) - The match score was 7‑6(6), 6‑3 in favour of Fonseca. (corroborated by 13 sources) - The win advances Fonseca to the round of 16 where he will face defending champion Ben Shelton. (corroborated by 13 sources) - Casper Ruud was ranked No. 14 in the world at the time of the match. (corroborated by 13 sources) - Ben Shelton is the defending champion and is ranked No. 10 in the world. (corroborated by 13 sources) - This is the first time a Brazilian has reached the Montreal round of 16 since Gustavo Kuerten in 2004. (corroborated by 13 sources) - Fonseca served five aces and made two double faults during the match. (corroborated by 13 sources) - The match lasted approximately 1 hour 54 minutes. (corroborated by 12 sources) - João Fonseca aims to become world No. 1 and win a Grand Slam within three to five years. (corroborated by 7 sources) - João Fonseca rejects the label “new Guga” and wants to be his own player. (corroborated by 7 sources) ## Timeline ### 2026-08-31: João Fonseca prepares for Tokyo ATP 500 return amid ranking drop João Fonseca drops to 33rd in the ATP season rankings as he prepares to return to competition at the ATP 500 in Tokyo, featuring stars like Carlos Alcaraz and the retirement of Kei Nishikori. 2 sources. https://clstr.news/cluster/joo-fonseca-prepares-for-tokyo-atp-500-return-amid-ranking-drop ### 2026-08-27: João Fonseca joins Brazilian Davis Cup squad for Switzerland tie Brazil has announced its Davis Cup squad for the upcoming tie against Switzerland in Rio de Janeiro, featuring João Fonseca following his recovery from an abdominal injury. 10 sources. https://clstr.news/cluster/joo-fonseca-withdraws-from-us-open-due-to-injury-3 ### 2026-08-24: João Fonseca withdraws from US Open due to injury Brazilian tennis star João Fonseca has withdrawn from the US Open due to an abdominal injury, marking his fourth physical setback this season. He will focus on recovery for the upcoming Davis Cup. 32 sources. https://clstr.news/cluster/joo-fonseca-withdraws-from-us-open-due-to-injury ### 2026-08-21: João Fonseca turns 20 while recovering from abdominal injury Brazilian tennis player João Fonseca turns 20 while recovering from an abdominal injury in Rio de Janeiro, aiming to prepare for the upcoming US Open after withdrawing from the Cincinnati Masters. 4 sources. https://clstr.news/cluster/joo-fonseca-turns-20-while-recovering-from-abdominal-injury ### 2026-08-18: João Fonseca withdraws from Cincinnati Masters due to abdominal pain Brazilian tennis player João Fonseca has withdrawn from the Cincinnati Masters 1000 due to left abdominal discomfort, prioritizing recovery for the upcoming US Open. 49 sources. https://clstr.news/cluster/joo-fonseca-withdraws-from-cincinnati-masters-due-to-injury ### 2026-08-16: Cincinnati Open: Jaime Faria upsets Ben Shelton as João Fonseca advances At the Cincinnati Open, Jaime Faria upset Ben Shelton, while João Fonseca reached the third round by defeating Botic van de Zandschulp, marking a significant milestone for Brazilian tennis. 25 sources. https://clstr.news/cluster/joo-fonseca-to-debut-at-cincinnati-masters-1000 ### 2026-08-07: Montreal ATP Masters 1000: Fonseca defeats Ruud to face Shelton At the Montreal ATP Masters 1000, João Fonseca defeated Casper Ruud to reach the round of 16, where he will face defending champion Ben Shelton. 77 sources. https://clstr.news/cluster/joo-fonseca-to-face-casper-ruud-in-montreal-masters-1000-third-round ### 2026-07-31: João Fonseca seeded 22, eyes top ranking at Montreal Masters 1000 João Fonseca, seeded 22 and ranked No. 27, opens the Montreal Masters 1000 with a bye, eyes a top‑10 run and a future world No. 1, rejecting the “new Guga” tag. 18 sources. https://clstr.news/cluster/joo-fonseca-seeded-at-montreal-masters-1000-as-top-players-withdraw ### 2026-07-28: João Fonseca gears up for US Open with Montreal Masters entry Brazilian João Fonseca returns to court, eyes US Open after a strong clay season, entering the Montreal Masters as a 24th seed. 9 sources. https://clstr.news/cluster/joo-fonseca-gears-up-for-us-open-with-montreal-masters-entry ### 2026-07-25: Brazilian tennis star João Fonseca speaks at Expert XP in São Paulo At São Paulo’s Expert XP, 19‑year‑old Brazilian tennis player João Fonseca, ranked in the mid‑20s, spoke about learning from setbacks, facing stars like Djokovic, and his aim to become world No. 1 and win a Sl 5 sources. https://clstr.news/cluster/brazilian-tennis-star-joo-fonseca-speaks-at-expert-xp-in-so-paulo ### 2026-07-03: João Fonseca targets US hard‑court swing after Wimbledon loss João Fonseca, ranked 27th, lost at Wimbledon and will play UTS in Rio, then Masters 1000 events in Montreal and Cincinnati, the US Open, and September’s Davis Cup, aiming for Top 20. 3 sources. https://clstr.news/cluster/brazilian-tennis-prodigy-joo-fonseca-eyes-us-open-after-wimbledon-loss --- Cite as: Fonseca withdraws from US Open due to abdominal injury. CLSTR, https://clstr.news/situations/joo-fonseca-2026-tennis-season