Overview
- Joao Fonseca led 3-6, 6-4, 4-1 when Denis Shapovalov retired with a right knee issue, prompting boos from the Basel crowd.
- Felix Auger‑Aliassime stopped with a left-knee problem after dropping the first set 6-3 to Jaume Munar.
- Casper Ruud withdrew against Alejandro Davidovich Fokina after losing a first-set tiebreak, citing ankle discomfort.
- The 19-year-old Brazilian advanced to his second Tour-level semifinal and first at ATP 500 level, setting up a meeting with Munar.
- A Sky Sports commentator questioned whether there were clear signs Shapovalov was hampered before his mid-match exit.