The win over Bertens, of the Netherlands, also
was her first-ever over a Top 10 opponent. The young American
lost in the qualifying round last weekend and made it into the
main draw only as a lucky loser.
Gauff will meet German Andrea Petkovic in Saturday's semifinal.
Petkovic beat Slovakian Viktoria Kuzmova 6-4, 6-1 in one of four
quarterfinals played Friday.
Gauff and Bertens each held serve in the first set, but Gauff
dominated the tiebreaker, jumping out to a 6-1 lead on points
before ending the set on a forehand winner.
In the second set, Gauff broke Bertens' serve at 1-1, and
Bertens was never able to recoup the break point.
Gauff was elated after the victory.
"I guess [Linz is] my little lucky place," Gauff added. "I
didn't know what to expect coming here, and I'm glad I was able
to take the best of the opportunity. I got in as a lucky loser
and I'm in the semis, so I hope I can keep this going."
In the other quarterfinals, Jelena Ostapenko of Latvia defeated
Elena Rybakina of Kazakhstan 7-5, 6-1, and Russian Ekaterina
Alexandrova topped Kristina Mladenovic of France 6-2, 6-4.
Alexandrova, the No. 8 seed in the tournament, is the only
seeded player left in the field.
Tianjin Open
All three remaining seeds lost in upsets in the quarterfinals in
Tianjin, China.
Russian Veronika Kudermetova needed just 73 minutes to oust No.
3 seed Dayana Yastremska of Ukraine 6-4, 6-0.
On Saturday, Kudermetova will face Britain's Heather Watson in
the semifinals after Watson ousted eighth-seeded Magda Linette
of Poland 7-5, 6-7 (4), 7-6 (6).
In the day's other quarterfinal, Ons Jabeur of Tunisia needed
two tiebreakers to defeat Yulia Putintseva of Kazakhstan 7-6
(5), 7-6 (4). Jabeur will meet Swede Rebecca Peterson in the
other semifinal.
Peterson moved into the semis with a three-set victory over
China's Wang Yafan on Thursday.
--Field Level Media
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