The Spaniard suffered a spinal injury this spring and has been unable to recover.
US Open will celebrate Billie Jean King and 50th anniversary of equal prize money on Monday night.
Novak Djokovic tuned up for the US Open playing tennis in Times Square.
Jack Sock and John Isner receive wild card into men's doubles field.
John Isner reflected on his surprising career that will end at this year's US Open.
The field is catching up to Swiatek, but Iga is accepting the challenge.
The Tunisian says she took time to get over her loss to Vondrousova in the final of Wimbledon.
