World No. 1 Jannik Sinner withdrew from the Cincinnati Open with a right knee injury this week, a significant blow to his preparation ahead of the US Open later this month. Sinner said he's not ready to compete but remains hopeful of fitness for the final Grand Slam of the season. Meanwhile, upsets defined the hard-court Masters events in Montreal and Toronto. At the 2026 Montreal (ATP), Y. Hanfmann defeated Flavio Cobolli and Agustin Tirante Thiago knocked out Taylor Fritz, both top-10 seeds falling in the Round of 64.
In Toronto, C. McNally stunned Linda Noskova in similar fashion. Alexandra Eala snapped a seven-match win streak when she lost to Belinda Bencic in the Round of 16 at the 2026 Toronto (WTA), though she overcame an ankle injury earlier in the tournament to reach that stage. The Masters series resumes this week with the 2026 Hamburg (ATP) beginning Monday, followed by the continuation of Toronto, as top players sharpen their form before the US Open.