Western Australia 198 & 6 for 115 (Stoinis 52*, Copeland 3-54) need another 202 runs to beat New South Wales 261 and 253 (Henriques 48, Edwards 47, Richardson 3-58)
A top-order collapse from Western Australia has left them with a mountain to climb in a fourth-innings chase against New South Wales at Perth Stadium.
The Warriors, who had successfully chased 313 against South Australia in their previous match, were set 317 to win. This time, though, their chase began diabolically with Will Bosisto lbw in the first over to Trent Copeland. Five balls later the dangerman Shaun Marsh was dismissed by Sean Abbott, caught at third slip on the drive, to leave the Warriors 2 for 1.
Hilton Cartwright became Copeland's second victim in the fifth over before WA produced a startling counter-attack. Instead of bunkering down, Mitchell Marsh and Marcus Stoinis played aggressively to try and dig the Warriors out of a hole.
They added 29 in 20 balls before Nathan Lyon bowled Mitchell Marsh through the gate for a run-a-ball 30 with a beautiful offbreak. Ashton Turner and Josh Inglis then fell within the space of six balls to leave WA 6 for 64 after 15 overs.
Stoinis kept going, reaching a rollicking half-century off just 45 balls. It included six fours and a six. He remained 52 not out at stumps with Ashton Agar on 20, but the Warriors still need to 202 to win with just four wickets in hand.
Earlier, Jhye Richardson claimed his maiden 10-wicket match haul in Sheffield Shield cricket, nabbing three second-innings scalps to go with his 8 for 47 in the first innings.
But it wasn't enough to prevent New South Wales from setting a fourth-innings target of more than 300. Kurtis Patterson, Moises Henriques and Jack Edwards all reached 40 but none could pass 50. Stoinis bagged three wickets and Mitchell Marsh two.