New South Wales have suffered a horror batting collapse to hand Western Australia a commanding eight-wicket Sheffield Shield victory and a big boost to their final hopes.

The Blues added just 24 runs for the loss of their last six wickets on the final morning at the WACA to be all out for 126 and a paltry lead of just eight runs.

They lost 6-3 off the final 52 deliveries with offspinner Marcus North taking 3-9 as he bowled into the footmarks.

WA made hard work of the miniscule run chase, losing Cameron Bancroft stumped second ball to Manjot Singh and Marcus Harris (2) caught at slip attempting a wild slog.

But North (4) and Adam Voges (4) brought up the winning runs, setting WA up for a tilt at the Shield final with games away to go against Queensland and NSW.

The Blues were on top of the ladder going into the match following a thumping innings and 48-run win over Victoria last week at the SCG and remain well in the hunt.

The game was evenly poised after two days with WA 5-263 in reply to NSW’s 344 but, from that point, the Warriors dominated, making 462 in their first innings for a 118-run lead as Voges scored 155 and Sam Whiteman 88.

NSW were then in trouble at stumps on day three at 4-102 but would have still been confident of at least having something to bowl at with first-innings centurion Ryan Carters at the crease.

Carters top-scored for NSW in the second dig with 37 but Sean Abbott, Singh and Josh Hazlewood all failed to score while Trent Copeland was the final wicket to fall for one.

Jason Behrendorff backed up his career-best 5-65 in the first innings for WA with 4-35 in the second while Michael Hogan also claimed 2-17.