Australia will need quick wickets early on day five if they are to win the second Ashes Test after England closed on 4-96 - a lead of 104 at Lord's.
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Australia have given themselves at an outside chance of victory in the rain-affected second Ashes Test following a day of high drama at Lord's.
England closed on 4-96 - a lead of 104 - and with the weather forecast to be fine and sunny on Sunday in London - all three results are possible on the final day.
Australia were once again reliant on Steve Smith to rescue their first innings after England dismissed the tourists for 250 in response to the host's 258.
Jos Buttler (10) and Ben Stokes (16) were the not out batsmen at the close after Peter Siddle (2-19) and Pat Cummins (2-16) ripped through England's top order.
However, the day was overshadowed by a sickening blow Smith received to the neck from a Jofra Archer thunderbolt.
Archer produced a blistering spell of bowling that saw him crank up speeds in excess of 153kmh in a thrilling eight-over stint where his pace continued to rise the longer he bowled.
Smith, who has been immovable throughout the series, had earlier taken a heavy blow to his left forearm from an Archer delivery before being poleaxed by a brute of a ball that reared up and hit him in the neck.
The Sydneysider left the field for 40 minutes to undergo the concussion protocol and resumed his innings on 80 before being trapped lbw by Chris Woakes for 92.
He is expected to be able to bat if required on Sunday, with Australia needing quick wickets in the morning session to give themselves a chaseable total to take a 2-0 series lead.
Coach Justin Langer said he expects another tense day in north-west London but felt his side could be in a much stronger position to win the match.
"This is why we love Test cricket so much," Langer said.
"Who would have thought, we're playing at Lord's, we've lost a couple of days - or nearly a couple of days - to rain and it's game on tomorrow.
"We probably went searching a little bit after a great start on this wicket.
"It's tough to bat on, which I don't mind, and it's going to be a great day's Test cricket tomorrow.
"I guess the only issue is there's only one day left in it so there's lots of scenarios that can play out, but it's game on."
Smith was the only player to pass 50 for Australia, who lost Matthew Wade (6) early in the day and skipper Tim Paine (23) just after lunch.
Cummins batted bravely for his 20 from 88 balls with Siddle (9) and Nathan Lyon (6) chipping in with some valuable runs.
Australia could have been in a much better position at the close, but once again failed to review two lbw decisions against Lyon that would have been overturned.
David Warner also put down two regulation slip catches.
Rory Burns, who would have been out when on 23 after being pinned back on the crease by Lyon, only added six more to his total before eventually falling to a beautiful Siddle delivery.
However, Stokes would have been out for three with Hawkeye showing the ball would have hit leg stump.
Australia failed to review three other decisions that would have been out in the first Test and Langer said his team must improve that record.
"It's frustrating, there's no doubt about that," he said.
"It can change a game, it can change a session, it can change a Test match, it could change a series. We need to get better at it."
STATE OF PLAY: England - 258 and 4-96 Australia 250 - England lead by 104 runs.
MAN OF THE DAY: Steve Smith. Held together Australia's innings yet again with a courageous knock of 92. Came back to the field 40 minutes after being hit on the neck by a sickening blow from a menacing Jofra Archer delivery to fall just short of fourth successive century in England.
KEY MOMENT: Archer reached speeds of 154km/h during a brilliant eight over spell and before felling Smith, he smashed him on his left arm an incident that appeared to rattle the previously immovable Sydneysider as England bowled the tourists out.
STAT OF THE DAY: Australia's failure to review two not out lbw decisions against Nathan Lyon late in the day denied them the chance to have England five wickets down and with a slender lead going into the last day.
QUOTE OF THE DAY: "I was saying 'Mate are you sure you're OK?'. These are like my sons alright, so you're never going to put them in harm's way, even though you're always in harm's way with Test cricket. He was going: 'Mate, I just want to get out there. I can't get up on the honours board unless I'm out batting." Coach Justin Langer on his conversation with Smith after he was hit.