Iga Swiatek made quick work of Japanese qualifier Ena Shibahara in a 6-0, 6-1 victory in the second round on Thursday to underline her title credentials at the U.S. Open.

Swiatek survived a slight scare in the first round when she committed a slew of unforced errors before sealing a hard-fought victory over Russian Kamilla Rakhimova, but against Shibahara, she was clinical and swatted her Japanese opponent aside in just over an hour.

"I'm playing, you know, not overpowering (tennis), but trying to be really solid and picking the right shots and being proactive. I'm happy with everything," Swiatek said in her on-court interview. "I just felt the rhythm much better. I was a bit tense in my last match, so today I just wanted to focus on the right things and focus on myself."

The Pole served with real accuracy in the first set, winning 89 percent of points on her first serve and converting three out of four break point opportunities to race into the lead against a frustrated Shibahara, who had no answers.

Japan's Shibahara, ranked outside the top 200 and in her first singles Grand Slam main draw, tried to turn things around in the second set and defended three break points in a marathon service game to hold for 1-1 and avoid the dreaded 'double bagel'.

That was the extent of her resistance, however, as Swiatek won the next five games in a row to clinch victory.

Swiatek said she had tried to block out the scoreline and focus on playing at her best level throughout the match.

"I just wanted to focus on technicalities and what I practiced yesterday on and trying to convert it to my match. Sometimes when the match goes pretty quick, your mind can drift off and you feel too safe," the 23-year-old added. "I was just trying to stay in the zone and it didn't matter to me if she was 3-0 or 6-0, it doesn't really matter. I just want to play and keep playing the same way."

Swiatek, who won the third of her five Grand Slams at Flushing Meadows, is next in action in a third-round tie against either Russian Anastasia Pavlyuchenkova or Elisabetta Cocciaretto of Italy.

Wang Xinyu of China lost to Yulia Putintseva of Kazakhstan 1-6, 6(4)-7 on Thursday, failing to advance to the third round.