WA limped to 3-28 at stumps on day three, still needing 323 runs to win with seven wickets in hand.

The visitors commenced at 1-85 in their first dig, before an inspired spell from Test star Pat Cummins helped dismiss WA for 191.

Middle-order batsman Marcus Stoinis appeared unlucky to be given out caught at first slip off Nathan Lyon after a gritty knock of 20, while Ashton Agar (33) also produced a solid knock.

NSW piled on a quick fire 98 without loss to set WA 352 to win with a day and a bit to play.

But the firepower of the home side proved too much for WA's top order who entered stumps in trouble, needing a big performance from the middle order to complete an unlikely victory.

D'Arcy Short (14*) and Stoinis (0*) will resume at the crease when play begins from 7:30am AWST tomorrow morning.