The New South Wales Blues are in total command heading into the final day of the JLT Sheffield Shield match against Western Australia at Perth Stadium.

The Blues were bowled out for 253 on Thursday with a lead of 316 and, in reply, the home side collapsed in the final session of day three to be 6/115 at stumps. They lost 6/64 within the first 15 overs.

Trent Copeland (3-54) continued his tremendous form with ball in hand this season and went to 23 wickets at 15.95 for the Sheffield Shield campaign.

Australian Test off-spinner Nathan Lyon has collected 2-34 from nine overs.

The unbeaten batsmen for Western Australia at stumps were Australian One-Day and, T20 International allrounder, Marcus Stoinis (52 not out) and Ashton Agar (20 not out).

Western Australian quick Jhye Richardson (3-58) completed his best match figures at the First Class level on day three. He returned 11-105 across both innings. Moises Henriques (48) top-scored for the Blues and was one of three batsmen to exceed 40 for NSW.

Eighteen-year-old Jack Edwards (47) and Kurtis Patterson, who followed his first innings century with a patient 43 from 123 balls, also made handy scores.

Western Australia v New South Wales - Day 3 - Highlights

Copeland was on a hat-trick after he claimed the final two Western Australian wickets of the first innings in consecutive deliveries, and although he did not achieve the trio, the seamer achieved the next best thing.

He struck Will Bosisto on the pads to remove the opener for a fourth ball duck in the first over.

Seamer Sean Abbott (1-23) then claimed the crucial wicket of Shaun Marsh, in the next over, also for a duck. The Australian Test batsman was caught by Edwards at third slip and the hosts were 2/1.

The ball again found the waiting hands of Edwards in the fifth over to remove Hilton Cartwright (8) and Copeland had another.

The collapse continued when Lyon bowled his Australian Test team mate Mitch Marsh for 30 from as many balls.

Ashton Turner (1) and Josh Inglis, for a third ball duck, were the next two batsmen to head back to the dressing room and Western Australia was in dire trouble six wickets down, before Stoinis and Agar guided the hosts to stumps.

Earlier in the day, the Blues resumed at 1/32 and, added 82 in the first session for the loss of one wicket, opener Nick Larkin (29).

However, five wickets fell in the second session and the match was back on an even keel.

A 63-run stand between Patterson and Henriques was broken shortly after lunch by Stoinis (3-43) and it was the first of the five to fall.

Stoinis dismissed Patterson and then Jason Sangha (4), leg before wicket, in his next over.

Henriques, Blues skipper Peter Nevill (18) and Copeland (7) were the other three wickets in the second session. 

Copeland was bowled by Richardson to give the 22-year-old quick his 10th wicket for the match. The visitors were 7/200 at tea.

Edwards took a positive approach immediately after the interval. He took 10 runs off the first over of the session.

The final three wickets added 71 runs to give the visitors a substantial lead in excess of 300. Abbott (16 from 12 balls) and Lyon (20 from 22) both made valuable contributions.

A stunning one-handed catch, low and to the right of wicketkeeper Josh Inglis, removed Abbott. It was the third dismissal for Stoinis.

Full scorecard here: