Stan Wawrinka defeated Emil Ruusuvuori 7–5, 7–5, 6–4 in the first round of Wimbledon on grass on 3 July 2023, producing an upset victory against the pre-match favourite. Despite Ruusuvuori entering as the odds-on favourite at 1.36, the Swiss veteran's superior grass-court experience and consistency across three sets proved decisive, with Wawrinka securing breaks at crucial moments to control each set. The victory marked a significant result for the 38-year-old, who converted his underdog status into a commanding performance. Wawrinka's win sets up a second-round encounter and demonstrates his continued competitiveness on the grass surface despite his age.