World number one Ashleigh Barty has pulled out of the US Open because of concerns over the coronavirus pandemic.
The first Grand Slam since tennis resumed is due to begin on 31 August at Flushing Meadows in New York.
The Australian, 24, was also set to play in the Western and Southern Open.
"There are still significant risks involved due to Covid-19 and I don't feel comfortable putting my team and I in that position," Barty told the Australian Associated Press.
"I wish the USTA all the best for the tournaments and I look forward to being back in the US next year.