Hercog dispatched the seventh-seeded German 6-1, 6-3 Saturday and will face Mathilde Johansson of France in Sunday's finale at the Bastad Tennis Stadium.
Johansson made it top the finals by ousting Johanna Larsson 6-4, 6-4 on Saturday.
Hercog and Johansson have only met once before. Hercog defeated Larsson in last year's Swedish Open to win her first WTA championship.
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