Former champion Amelie Mauresmo made a shock exit in the third round of the Australian Open at the hands of home favourite Casey Dellacqua.
Mauresmo struggled against an inspired opponent
The 18th-seeded Frenchwoman, who won the title in 2006, was woefully off form and committed 43 unforced errors on her way to losing 3-6 6-4 6-4.
"Confidence was the problem and not playing with the aggression that I should have," admitted Mauresmo.
Dellacqua, ranked 78 in the world, now faces third seed Jelena Jankovic.
Mauresmo, 28, has endured a torrid time since going out of last year's tournament at the fourth-round stage.
She had an appendectomy in March and sat out two months, then missed another two months with an injured groin muscle and did not play at the US Open.
The injuries and indifferent form meant she ended last year ranked 18th, a drop from number three the previous year when she had Grand Slam wins at the Australian Open and at Wimbledon.
Two weeks ago, she re-injured her groin muscle during training before the Sydney International the week before the start of the Melbourne tournament.
Against Dellacqua, the Frenchwoman's game was littered with errors and 10 double faults.
It's a wonderful feeling to be out here and to do myself and Australia proud
"Well, it's definitely not the best thing to do in key moments, for sure" she said.
"Not only that, I'm sure you have other statistics on unforced errors and things like that that are pretty high."
Dellacqua, was overwhelmed after her win, and said: "I'm shaking so much. I'm so excited.
"It's a wonderful feeling to be out here and to do myself and Australia proud."
Dellacqua, whose win saw her become the new Australian number one, is now ready to give it her all again in her fourth-round clash with Jankovic.
"I've got nothing to lose," she said.
"I've played Jelena before so I know a bit about her game so I'll just go out there and have fun and go for it."