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NEW YORK — Karolina Pliskova dominated with her serve to roll past 18-year-old Ana Konjuh and into the U.S. Open semifinals.

The 10th-seeded Pliskova won 6-2, 6-2 in just 57 minutes Wednesday, losing only one point on her serve in the first set. She’ll face No. 1 Serena Williams or fifth-seeded Simona Halep on Thursday.

The 24-year-old Czech came into the U.S. Open with the distinction of being the only woman in the top 20 to never reach a Grand Slam round of 16. Now she’s blown past that milestone, riding the momentum of a breakthrough title at Cincinnati, where she beat second-ranked Angelique Kerber in the final.

The 92nd-ranked Konjuh hadn’t been past the third round at a major before this tournament. Also a big server, she had more aces than Pliskova on Wednesday, but she was broken four times and made 27 unforced errors.

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Source: CBS Sports Headlines / Karolina Pliskova defeats Ana Konjuh to reach U.S. Open semis