Casey Dellacqua wasn't the last of the Australian women to depart the torunament after Nicole Pratt crashed out earlier in the day.
Pratt went out in straight sets then declared her conqueror, Anna Chakvetadze, too mentally fragile to win the title.
Chakvetadze arrived at the event one of the hottest players on tour, having scorched her way to four titles in 2007 and risen to a career-high No.6 in the world.
The 20-year-old also reached the quarter-finals at the Australian Open and French Open this season, falling on both occasions to her celebrated countrywoman and two-time major champion, Maria Sharapova.
Under the grand slam spotlight for the first time at Melbourne Park in January, Chakvetadze suffered a mini meltdown in her 7-6 (7-5) 7-5 loss to Sharapova and Pratt maintained today that the highly-rated youngster was still not ready to break through
on the sport's biggest stage.
"No, not at the moment. She's not,'' the veteran Australian said after unsettling Chakvetadze at times during the match.
"There are too many weakness there that people can take advantage of. She's got potential but she's still got a lot of work to do.''
Pratt sensed Chakvetadze was close to folding when facing break points serving at 3-4 in the second set.
"I had a couple of balls to go 5-3 up in the second set and I felt like the momentum had shifted,'' Pratt said.
"I felt like if I could get to a third set, I knew that emotionally she's susceptible. So I thought `If I could get to a third set, I like my chances'.
"But unfortunately it didn't happen.''
Chakvetadze's compatriot Svetlana Kuznetsova, the 2004 Open champion, also doubted whether the sixth seed had the nerve to win the tournament.
``I think everything is possible. I think the draw is pretty open. But the thing is, what's her best result in a grand slam?,'' Kuznetsova said when asked if she thought Chakvetadze was ready to make a major impact at Flushing Meadows.
``The question is if she can handle the pressure. (That's) the question is for every player, I think.''