Quentin Halys defeated Jan Lennard Struff 6–3, 7–6 in the semi-final of the ATP 250 Gstaad tournament on hard court on 20 July 2024, upsetting the pre-match favourite Struff, who carried odds of 1.42 to Halys's 3.11. Halys secured the first set decisively before taking a competitive second set to a tie-break, which he won to advance to the final. The upset victory marked a significant result for Halys at the Swiss event and demonstrated his capacity to overcome a higher-seeded opponent in a decisive moment.