Russian world number two Daniil Medvedev prepared for the US Open by beating American Reilly Opelka in the Canadian Open final, while Italy's Camila Giorgi won the women's title.
Medvedev - US Open runner-up in 2019 and semi-finalist in 2020 - needed just 85 minutes to beat Opelka 6-4 6-3 in Toronto and win his 12th ATP title.
World number 71 Giorgi shocked Czech fourth seed Karolina Pliskova to win 6-3 7-5 in Montreal. It is the 29-year-old's first WTA Tour victory since 2019.
The US Open begins on 30 August.
At the Cincinnati Masters, Britain's Heather Watson made it through qualifying, beating Sweden's Rebecca Peterson 6-4 4-6 6-3.
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