The world No 1 will now set his sights on next week's US Open.
In the women's event, Aryna Sabalenka thrust herself into US Open title contention with a defeat of Jessica Pegula in the final.
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Jannik Sinner on Monday lifted his third ATP Masters trophy as the world number one beat Frances Tiafoe 7-6 (7/4), 6-2 to win the Cincinnati Open.
The Italian top seed warmed up for next week's US Open in style, biding his time in a hard-fought first set before breaking the match open in the second.
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