Caroline Wozniacki picked up her biggest win to date since returning to the tour as she defeated No 11 seed Petra Kvitova to reached the US Open third round.

Source: https://www.express.co.uk/sport/tennis/1807769/US-Open-updates-scores-Murray-Djokovic-Alcaraz-Swiatek-Gauff

Petra Kvitova, of the Czech Republic, returns a shot to Caroline Wozniacki, of Denmark, during the second round of the U.S. Open tennis championships, Wednesday, Aug. 30, 2023, in New York.

Source: https://www.baytoday.ca/national-sports/caroline-wozniacki-beats-petra-kvitova-at-the-us-open-shortly-after-coming-out-of-retirement-7479282

She is the first teenager to win four WTA tournaments since April 2009, when Caroline Wozniacki got the fourth of the seven trophies she collected as a teenager.

Source: https://www.theguardian.com/sport/2023/aug/06/coco-gauff-beats-maria-sakkari-to-win-dc-open-for-fourth-title-of-career

Wozniacki, 33, retired from tennis in 2020.

Source: https://wabcradio.com/2023/08/17/venus-williams-caroline-wozniacki-receive-u-s-open-wild-cards/

Wozniacki retired three years ago in large part because rheumatoid arthritis was one opponent that she was struggled to beat at the time.

Source: https://www.forbes.com/sites/brucelee/2023/09/03/2023-us-open-wozniacki-svitolina-highlight-growing-tennis-trend-big-comebacks-after-having-children/