Patricia Maria Tig came from behind to beat favourite Alison van Uytvanck 3-6 6-1 6-2 in the final of the Karlsruhe Open.
World number 65 Van Uytvanck - who beat her partner Greet Minnen in the first round - had been expected to lift the title in the inaugural edition of the clay court tournament in Germany.
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But Tig, ranked 223, fought back from a set down on Sunday.
Van Uytvanck broke serve three times as she nosed ahead, but Tig - who only dropped one set throughout the entire tournament - responded with three breaks of her own to restore parity.
And, after breaking once more to make it 4-2 in set three, 25-year-old Tig got the better of Van Uytvanck's serve to claim her first WTA title with two match points to spare.
