- Wimbledon women's singles champion Linda Noskova suffered a straight-sets defeat to American Caty McNally at the Canadian Open , marking her first loss since her All England Club triumph.
- World No 3 Alexander Zverev , a Wimbledon men's singles finalist, was also defeated in his first match in four weeks, losing in three sets to Tallon Griekspoor.
- This defeat is the first time all season Zverev has lost his first match of any tournament.
- Fourth seed Daniil Medvedev was another high-profile casualty, losing to Botic van de Zandschulp, while Briton Cameron Norrie advanced.
- Noskova, Zverev, and Wimbledon champion Jannik Sinner are all set to compete at the Cincinnati Open, the final masters-level tournament before the US Open.
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