Speaking after the victory, the 27-year-old said: "Almost every tournament I've played this year there has been a rain delay so at this point I just have to laugh because I feel like it is following me".
And Svitolina - who lost to Halep in the quarter-finals of the French Open - showed no mercy against her highly-fancied opponent from the outset, racing through the opening set.
In doubles play, Ottawa's Gabriela Dabrowski and Latvia's Jelena Ostapenko defeated Germany's Julia Goerges and Ukraine's Olga Savchuk 4-6, 6-2, 10-3.
Second-seeded Simona Halep of Romania needed only 59 minutes to breeze by Barbora Strycova of the Czech Republic 6-1, 6-0 while American Sloane Stephens upset third-seeded German Angelique Kerber 6-2, 6-2. "It's really hard to get to Cincinnati and there's no tickets, so I needed to get them".
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EPA/WARREN TODACaroline Wozniacki of Denmark celebrates her win over Sloane Stephens of the U.S. after their semi-final match in the Rogers Cup Women's Tennis tournament in Toronto, Canada, 12 August 2017. While Stephens put up a bit of a fight in her third tourney back after an 11-month injury absence, she made far too many mistakes to have a legitimate chance against a player like Wozniacki, who defends with zeal and limits her errors.
The challenge should be stiffer for both players in the final than it was in the semis.
"I think I was moving very well and retrieving and just trying to stay aggressive when I could", Wozniacki said in AP report.
"And physically it was very tough because she gets to lots of balls. She's strong there and she played her game". So it's really tough to analyze the game. I have just to move on and to look forward.