Brisbane, Australia, 31 December 2012 | AAP

In a blow to her Australian Open preparations, an off-key Sam Stosur fell 7-6(4) 7-5 to Swede Sofia Arvidsson to be the second top-10 star upset on Pat Rafter Arena on Monday.

The Queenslander followed former world No.1 Caroline Wozniacki, who lost to Ksenia Pervak, out of the tournament in a disappointing one hour and 44 minute display.

Underdone heading into the 2013 season following a minor ankle operation five weeks ago, Stosur moved freely but her groundstrokes were rusty and judgment off.

While she showed plenty of fight to save five first-set points, the world No.9 leaked 48 unforced errors, including seven double faults.

Stosur denied home pressure contributed to the loss, instead laying most blame at her short preparation after only returning to the practice court in the past fortnight.

“Part of it can be put down to being a bit rusty and it’s the first match of the year,” she said.

“I think a big part of it is that I haven’t done enough (practice).

“I don’t think (the home pressure) had much to do with it really.”

But Stosur, who will play in Sydney next week, admitted it did irk her greatly that she’d yet to deliver the goods in Australia.

Arvidsson successfully attacked Stosur’s normally difficult second serve, winning two-thirds of the 27 points by taking the kick serve early.

Stosur had enjoyed a 3-1 head-to-head advantage over world No.41 Arvidsson and had swept the tall Swede aside in the first round of her 2011 US Open triumph.

However the writing was on the wall in the seventh game as she lost her serve with a string of poor groundstrokes.

The 28-year-old seemed to produced her best when it most mattered – breaking Arvidsson twice when she served for the set – but paid for her inconsistency.

She did her best to hang in in the second set, as Arvidsson held serve with ease, before producing a forgettable last service game to fall on her sword.

Earlier in the day, Stosur’s compatriots Olivia Rogowska and Bojana Bobusic were also beaten in the first round of the tournament at Brisbane’s Queensland Tennis Centre.

Bobusic, a qualifier, fell in three sets to Frenchwoman Alize Cornet, while Rogowska was bundled out in straight sets by Monica Puig of Puerto Rico.