On Saturday, however, Pliskova had to save a match point against her in the second set before rallying for a 3-6, 7-5, 6-4 victory.
The quality of play was relatively equal on both sides of the net, but it was Pliskova who outlasted her game opponent.
"Right before I went to the locker room, my coach told me", Rogers said. "And it was in".
But for now, Pliskova has kept herself alive and kicking and she will take on either Jennifer Brady or Monica Niculescu in the last-16.
Pliskova ripped off nine aces during her victory over Zhang, who's now ranked as the No. 27 player in the world.
American CoCo Vandeweghe is moving on to the round of 16 at the U.S. Open.
Seventh-seeded Grigor Dimitrov of Bulgaria was sent packing as Russian Andrey Rublev fired 36 winners while registering a 7-5, 7-6 (3), 6-3 upset. But if Muguruza reaches the semis, Pliskova needs to win the title.
Alexandr Dolgopolov pulled off the big win Thursday at Flushing Meadows, beating 2010 Wimbledon runner-up Berdych 3-6, 6-1, 7-6 (5), 6-2.
"I think I stressed myself a little bit after playing Kerber, and I just had more expectations with myself.", she said.
Photo Zhang, who is ranked 26th in the world, almost upset Pliskova.
"I think", Lopez said, "he's OK".
Zhang has reached the third round for the second consecutive year at the U.S. Open but has a hard task of progressing into the second week at the expense of big-serving top seed Pliskova.
But something was affecting her serve, normally one of her most potent weapons.
She bulldozed her way through the opening set as Pliskova struggled with her first serve.
But Halep's tough first-round loss to Maria Sharapova as good as closed the door on her chances, and Wozniacki, Konta, and Kuznetsova excluded themselves by also losing too soon.
"It's kind of tough for me this year to play here". "I don't feel like I'm playing that good again, but I'm still in the draw, actually, so I'm not going to be that sad".
Pliskova, however, admitted that she sometimes had problems to stay composed. The other two are Spaniard Garbine Muguruza and Ukrainian Elina Svitolina are She play the victor of the match between American Jennifer Brady and Monica Niculescu. You try to stay in the moment. "I had my chances, I didn't use them". I was exhausted and laying there felt nice. "I felt like I was prepared, I just couldn't bring it".
Pliskova said that while she may appear stone-faced on the court there are plenty of emotions running through her veins. "I'll just go out there and compete and have fun".
The Argentine won the 2009 U.S. Open when he beat Rafael Nadal in the semifinals and Roger Federer for the title.
The Czech top seed lost the first set to American Nicole Gibbs but recovered to win 2-6, 6-3, 6-4.
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