LIVE SCORES
Shaun Marsh (five) continued his lean run with another failure and the rest of WA's top six fared little better as the Blues took control after winning the toss and choosing to bowl.
Discarded Australian quick Mitchell Starc impressed in his new ball spell and dismissed Marsh to have figures of 2-27 off eight overs at the halfway mark, while Chris Tremain (1-11 off six) impressed on debut.
And with the Warriors already in trouble in the battle of the bottom two sides at three wickets down, Sean Abbott (2-25 off six) took two wickets in as many balls and Starc claimed another.
Marsh, Travis Birt (zero) and Liam Davis (10) fell early before a dreadful run, which saw them lose 3-5 and slump to 6-62, leaving Luke Ronchi (seven not out off 15 balls) and all-rounder Nathan Coulter-Nile, unbeaten on 15 off 14, a huge task to post a competitive score.
Wes Robinson was dismissed for 17 off 55 deliveries and Craig Simmons (14) and debutant Tim Armstrong (zero) also fell cheaply as the WA middle order collapsed in the absence of Marcus North, Adam Voges and Mitch Marsh.
The run-rate was just 3.40 at the halfway mark, with the slow batting of Robinson, who scored just 15 off his first 50 balls, the continual flow of wickets and the tight bowling of the likes of Blues captain Stephen O'Keefe (1-17 off five overs) keeping it down.
WA made a nightmare start to their innings when Marsh, who now has just 37 runs from his past four domestic innings', cut a Starc delivery down the throat of backward point Steven Smith, while the situation worsened significantly when Tremain trapped Birt lbw.
Davis survived several strong appeals early in his innings but the Shield triple-centurion was the next to fall when he edged an attempted late cut to wicketkeeper Brad Haddin.
The slow scoring rate, which saw the Warriors score just 43 runs in the first 15 overs, shaped as the home side's biggest problem until Robinson and Armstrong fell off consecutive Abbott deliveries playing poor shots.
And when Simmons top-edged a Starc delivery high in the air and was caught in mid on, it left WA's tail exposed for nearly 30 overs and gave the bottom side a massive challenge to win just their second game of the year.
