Reigning US Open women's champion Bianca Andreescu said Thursday she will not defend her title, saying the COVID-19 pandemic has contributed to an inability to prepare for the event. The 20-year-old Canadian, who defeated Serena Williams in last year's final, said she wants to concentrate on being at her best when she does return to competition. Her decision means that this year's event, which starts in New York on August 31, will be without both of its 2019 champions after Rafael Nadal also said he would skip the tournament over health fears.

"After many discussions with those closest to me, I have made the difficult decision not to return to New York this year," Andreescu said in a statement released on social media. "I have taken this step in order to focus on my match fitness and ensure that I return ready to play at my highest level." Those who aren't playing in the US Open on the women's side include Australia's top-ranked Ashleigh Barty, Ukraine's fifth-ranked Elina Svitolina, and sixth-ranked Andreescu. Serena Williams, one title shy of matching the Grand Slam singles record 24 won by Margaret Court, will be at Flushing Meadows. Andreescu defeated Williams 6-3, 7-5 in last year's US Open final.