The Polish star beat America’s world no. 78 Claire Liu in straight sets, 6-2, 6-2, in their Round of 16 match on Thursday evening, public broadcaster TVP Sport reported.
It was a dominant display from Świątek, who has already won against Liu at Indian Wells and French Open this season, according to news outlets.
The Polish world no. 1 will now play the 8th seed Linda Noskova, the world No. 59 from the Czech Republic, for a place in the semifinals.
The BNP Paribas Poland Warsaw Open, the country’s biggest tennis tournament, is played on an outdoor hard court this year.
Last year, France's Caroline Garcia triumphed in Warsaw on clay, eliminating Świątek in the quarterfinals.
The 2023 BNP Paribas Warsaw Open runs until July 30.
Świątek this month reached the quarterfinals of the Wimbledon Grand Slam tournament in London, where she succumbed to Ukraine’s former world No. 3 Elina Svitolina 5-7, 7-6, 2-6.
Last month, the Polish player won the French Open for the third time after defeating Karolína Muchová of the Czech Republic in the final to claim her 14th career singles title.
Świątek, coached by countryman Tomasz Wiktorowski, has topped the world rankings since April 4, 2022.
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Source: TVP Sport, WTA, tennis.com