Top-seeded Petra Martic rallied past Russian qualifier Liudmila Samsonova to reach the quarterfinals of the Palermo Ladies Open.
Past U.S. Open champions Kim Clijsters and Andy Murray received wild-card invitations for the Grand Slam tournament.
The tournament will take place in a quarantined setting from Aug. 31-Sept. 13 in New York. The Western & Southern Open, which was relocated from Cincinnati this year, will be held from Aug. 20-28 as a warm-up event for the Grand Slam. Murray, a former world number one who won his U.S. Open title in 2012, also received a wildcard entry into the Western & Southern Open, but said on Monday that players travelling to New York need assurance that they would not face mandatory quarantine after returning to Europe.