MELBOURNE, Australia -- The pressure of coming into the Australian Open as a Grand Slam winner proved too much for Sam Stosur.
The reigning U.S. Open champion crashed out in the first round, beaten 7-6 (2), 6-3 by Sorana Cirstea in front of her home crowd at Rod Laver Arena on Tuesday. Her bid to end a 34-year drought for Australian women at the Australian Open was in tatters on just the second day of the tournament.
As Stosur spoke to the media afterward, her eyes appeared red and slightly swollen.
"I'm probably very close to crying, having a really awful night," Stosur said. "It's hard to suppress those emotions when it means so much to you."
The sixth-seeded Stosur has never gotten past the fourth round at the Australian Open. In 10 trips to Melbourne Park, Stosur has lost in the first round three times -- the last time in 2005.
The defeat wasn't entirely surprising. She also lost early at two tuneup tournaments, and after going out in the first round at the Sydney International, she admitted she was struggling to cope with the pressure.
"The whole emotional side of things really took over," the 27-year-old Stosur said. "It never felt like I was able to be loose and free with the way I wanted to play."
Williams, a 13-time Grand Slam winner, frequently yelped in frustration as some of her shots failed to come off in only her third match since reaching the U.S. Open final last September. She completed the victory with a service winner after 1 hour, 19 minutes in the final match of the second day.
Williams, the 13-time Grand Slam champion, is on a 15-match winning streak at Melbourne Park having won back-to-back titles in 2009 and 2010 before missing last year's tournament with an injury.
Stosur has been working with a psychologist from the Australian Institute of Sport since last April to try to overcome the stress she sometimes feels on the court. It helped her rediscover her form after falling flat in the 2010 French Open final against Francesca Schiavone.
Against 13-time Grand Slam winner Williams in the U.S. Open final last September, Stosur stayed remarkably calm in a commanding 6-2, 6-3 win. It was Williams who lost her cool in front of a home crowd, and Stosur remained composed long enough to become the first Australian women since Evonne Goolagong Cawley at Wimbledon in 1980 to win a Grand Slam singles title.
Against No. 59-ranked Cirstea on Tuesday, however, Stosur could hardly keep the ball in court, spraying 33 unforced errors.
"I think for sure it affects you physically," Stosur said of her nerves. "I think it is easy to see that you tighten up, your shoulders do get tight, you don't hit through the ball.
"When anyone's nervous, I think the first thing that goes is your footwork. You don't move your feet as well. Once that breaks down, it's easy for other things to start breaking down."
Cirstea was all too aware of the baggage Stosur was carrying.
"She had the pressure. I had nothing to lose," Cirstea said. "Sam, she's a great player. She just won the U.S. Open. She had a lot of pressure on her shoulders coming out today. I just tried to play my best.
No Australian woman has won the title since Chris O'Neil in 1978. Hana Mandlikova won the Australian Open in 1980 and 1987 while competing as a Czech, but didn't go past the quarterfinals after becoming a naturalized Australian in 1988.
The men's drought is longer, dating to Mark Edmondson's win in 1976 -- Pat Cash, Pat Rafter and Lleyton Hewitt could win majors elsewhere, but not at home. Cash was quoted in the local media on the morning of Stosur's match, sympathizing with her struggles.
"It gets really tough for us here," he said. "The problem is so many people want a piece of you during the Australian Open. It's got to Lleyton Hewitt over the years, it encumbered Pat Rafter, who never played anything like as well as he did at the U.S. Open, or even Wimbledon, and it's not really helping Sam."
Stosur's exit maintains a trend in women's tennis. The last four Grand Slam champions have lost early at their next major tournament. Kim Clijsters won the Australian title last year, only four months after winning the U.S. Open. But then she lost in the second round at the French Open and didn't contest Wimbledon or defend her U.S. crown. French Open finalist Li Na went out in the second round at Wimbledon and in the first round in New York. Wimbledon champion Petra Kvitova lost in the first round at Flushing Meadows.
"Part of it is just that heightened expectation of wanting to do well, all that kind of thing," Stosur said. "I struggled the couple weeks after the U.S. Open and then finished well at the (year-end) championships, had a month off, then trained for a month.
"I don't know why it seems to be happening more often than not right now. I'm sure if we could all change the way we've responded straight after winning a Grand Slam, we would have."
Stosur plans to take a few days off "to get away" before she focuses on the rest of the season, knowing it can only get better.
Kvitova, ranked second, avoided any such letdown as did No. 4 Maria Sharapova as both advanced with lopsided wins.
After surrendering her opening service game with a double-fault, Kvitova won 12 consecutive games in a 6-2, 6-0 win over Russia's Vera Dushevina.
Kvitova reached the quarterfinals here last year at the start of a season in which she surged up the rankings.
Last week, she missed a chance to overhaul Caroline Wozniacki's No. 1 ranking when she lost in the Sydney International semifinals. She needed to win the Sydney tournament to take the top ranking.
But she gets another chance at Melbourne Park, where she's one of six women who can finish No. 1.
Sharapova, a former Australian Open and Wimbledon champion, won the first eight games of a 6-0, 6-1 win over Gisela Dulko of Argentina in her first match since returning from a left ankle injury.
The 2008 champion needed just 58 minutes for the win and the only game she lost was on her own serve. She then saved three break points in the last game before serving out the match.
"I've been here for 14 days getting used to the conditions," Sharapova said. "Back in the heat now, but it was like winter before. Different preparation, but sometimes it's just the way it goes."
Other women advancing included No. 9 Marion Bartoli, No. 14 Sabine Lisicki, No. 17 Dominika Cibulkova, No. 27 Maria Kirilenko, Canada's Aleksandra Wozniak, Shahar Peer of Israel and 2000 Wimbledon semifinalist Jelena Dokic.
Information from The Associated Press was used in this report.