BRISBANE: Former US Open champion Samantha Stosur’s miserable Australian form continued on Monday when she was knocked out of the first round of the Brisbane International by Sweden’s Sofia Arvidsson.

Arvidsson took full advantage of 48 unforced errors from the Australian number one to win 7-6 (7/4), 7-5 on Pat Rafter Arena.

Stosur, who grew up on the nearby Gold Coast, has struggled to live up to expectations when playing in her home tournament and has not made it past the second round in four attempts.

She has also failed to make an impression at the Australian Open, last year losing in the first round to Romania’s Sorana Cirstea as sixth seed.

Stosur began confidently against Arvidsson but fell away dramatically as her error rate climbed and despite fighting hard to stay in the match, she never seriously threatened the Swede.

Earlier, former world number one Caroline Wozniacki lost valuable Australian Open match practice when she lost to Kazakhstan qualifier Ksenia Pervak.

In a titanic battle lasting 2hrs 48mins, left-handed Pervak eased past Wozniacki 2-6, 6-3, 7-6 (7/1) in the first shock of the season-opening WTA tournament.

Eighth-seeded Wozniacki had looked in control as she reeled off the first set in just 29 minutes.

But the Russian-born Pervak found her range in the second set and had the Dane constantly under pressure with her swinging left-handed groundstrokes.

She won the set to level the match then stunned Wozniacki in the deciding set with an all-out attack.

“I had a really tough match yesterday, we played for three hours and I was tired in the beginning,” Pervak said.