It took little more than an hour for Poland's Swiatek to beat Kazakhstan's Yulia Putintseva in straight sets 6-1 6-2.

Wozniacki, from Denmark, defeated three-time Grand Slam winner Angelique Kerber in 90 minutes 6-4 6-2, advancing to her first WTA 1000 quarter-final since 2019 after returning to the tour.

After her match, former world number one Wozniacki said she will have to play her "best tennis to compete" with Swiatek.

"I think I have obviously commentated some of her matches," she said. "I know how she's playing. Obviously she's playing good tennis, playing powerfully.

"I practiced with her as well a few times after I have come back, during the US Open as well. I know how she plays, but it's one thing knowing how she plays and also playing against her in a full match."

Swiatek said on court that she has great respect for Wozniacki.

"I think she's playing great even after the maternity break. She was fighting to come back.

"I have huge respect. I'm going to prepare like any other, but off the court she's a great person."

Ukrainian Marta Kostyuk defeated Russian Anastasia Pavlyuchenkova 6-4 6-1, while Russian Anastasia Potapova defeated Italian Jasmine Paolini 7-5 0-6 6-3.