It was the second title of the season for Lisicki, who dispatched Rezai 6-2, 6-1 in just 49 minutes and added another trophy to go with her win in Birmingham, England, earlier this season.
The fifth-seeded German improved to 3-2 all-time in finals after winning 4-of-5 break points and 32-of-38 of her service points.
Rezai, meanwhile, fell to 4-3 in title matches.
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