The Italian top seed warmed up for next week's US Open in style, biding his time in a hardfought first set before breaking the match open in the second.
Tiafoe, whose game faded after losing the first-set tiebreaker, still made an impression.
The American, who moves into the ranking top-20, saved three match points before Sinner claimed his 15th career title.
Cincinnati is the fifth trophy of 2024 for the 23-year-old Italian, who began the season with an Australian Open crown in Melbourne.
"I'm happy, this was a very difficult week," Sinner said."It was tough mentally but I tried to do my best.
This story is from the August 21, 2024 edition of The Citizen.
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This story is from the August 21, 2024 edition of The Citizen.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
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