Williams lost to Simona Halep on Saturday in the Wimbledon final. She also lost last year in the final at Flushing Meadows to Naomi Osaka of Japan, leaving her one behind Margaret Court's total of 24 Grand Slam titles.
Along with Williams, Halep and Osaka, the rest of the Grand Slam champions in the women's field are No. 1 Ashleigh Barty, past U.S. Open champions Venus Williams, Sloane Stephens, Angelique Kerber, Maria Sharapova, Petra Kvitova, Victoria Azarenka, Caroline Wozniacki, Garbine Muguruza and Jelena Ostapenko.
Both fields will be rounded out by 16 players from the U.S. Open qualifying tournament and eight wild cards.
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