Ukrainian qualifier Lesia Tsurenko won seven straight points to finish off fifth-seeded Ekaterina Alexandrova 6-4, 7-6 (2) of Russia in the opening round of the Upper Austria Ladies Linz on Monday.
Tsurenko came back from a break down in the second set and from 2-0 behind in the tiebreaker.
Alexandrova, who reached the final of the Kremlin Cup last month, was a semifinalist at the Austrian indoor event last year and a runner-up in 2018.
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Tsurenko next plays Alison Van Uytvanck of Belgium, who routed Austrian wild card Sinja Kraus 6-1, 6-0.
Xinju Wang of China rallied to beat Kateryna Kozlova of Ukraine 2-6, 6-2, 6-3 to set up a match against the top-seeded Emma Raducanu. The U.S. Open champion from Britain had a bye in the opening round.
Also advancing were Alizé Cornet of France, Greet Minnen of Belgium, Jaqueline Cristian of Romania, Rebecca Peterson of Sweden, and Anhelina Kalinina of Ukraine.