Qualifier Mona Barthel rallied to upset third-seeded Barbora Strycova 3-6 6-2 6-3 and advance to the final of the Prague Open.
Seeking her fourth WTA title, the German faces unseeded Kristyna Pliskova, who defeated Jelena Ostapenko 6-4 6-2 in the other semi-final.
Big-serving Pliskova was 5-2 up in the second set but faced a break point at 30-40. The Czech served two straight aces - out of a total 17 - before converting her first match point to advance to her second career WTA final. She won her only title last year.
The 82nd-ranked Barthel improved her record against the 18th-ranked Strycova to 4-3.
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