Australia bowled out for 177 to lose by 134 runs - heaviest World Cup defeat by runs
Stoinis given out caught behind on review but ball appeared to flick glove that was off the bat
Smith given out lbw on review - batter felt ball was missing leg stump
South Africa post 311-7 - De Kock 109 (106), Markram 56 (43); Maxwell 2-34
De Kock hits second century in as many matches
Sloppy Australia drop five catches, with Zampa also failing to get to chance
It's been a day of toil for Josh Hazlewood, who is dripping with sweat, and his task is not getting any easier.
Aiden Markram goes deep into his creases and feasts on a short ball from the Australia seam bowler, biffing it square for the third boundary of the over.
Aaron Finch
Former Australia captain on BBC Test Match Special
Klaasen is so still and stands so tall at the crease. That's a beautiful shot.
This man is in some serious form.
South Africa making hay against the seamers, and knocking the spinners around.
Gorgeous cut shot off the back foot from Heinrich Klaasen as he lasers Josh Hazlewood beyond Steve Smith at point for four.
A couple of balls later and Klassen uses his strength to muscle it across the line between long-on and mid-wicket for another four.
South Africa upping the tempo now.
The freewheeling, clean-striking Heinrich Klaasen has joined Aiden Markram at the crease for South Africa.
Markram has looked a million dollars against Australia's seamers - see exhibit A below - but is happy to knock Glenn Maxwell, who has 2-30 from nine overs, into the gaps.
Worth reflecting on Quinton de Kock's second consecutive World Cup hundred before we see his strange dismissal, though.
As they used to say on a reality TV show which recently returned to our screens, Quinton here are your best bits...
Three South Africa wickets have fallen so far.
We'll have that curious Quinton de Kock dismissal shortly.
In the meantime, here's the first two
Geoff Lemon
BBC Test Match Special commentator
That is an extraordinary dismissal. Quinton de Kock got himself in a tangle and that is a huge wicket for Australia.
Aaron Finch
Former Australia captain on BBC Test Match Special
De Kock just felt the pressure building slightly, especially from Glenn Maxwell.
Not your traditional reverse sweep, he's tried to really flick it over the top and top-edged it onto his chest onto his bat and rolls back onto the stumps.
That's a huge momentum shift.
De Kock b Maxwell 109 (SA 197-3)
A quite bizarre dismissal, perhaps explaining why Quinton de Kock had not been confident taking on Glenn Maxwell.
The South Africa left-hander attempts to play a reverse sweep but ends up spinning his body round and deflecting the ball on to his stump off, I think, the back of his bat via his body and gloves.
Geoff Lemon
BBC Test Match Special commentator
Another boundary from Markram off Cummins. Another little insult after that catch was shelled.
Aiden Markram has eased himself back into the groove from that record-breaking knock against Sri Lanka in South Africa's opening game.
He dispatches the first ball of Pat Cummins' sixth over through the covers with an efficient drive. Four balls later and we see that nice high elbow as he strikes it crisply beyond mid-off for another boundary.
Firdose Moonda
Cricinfo writer on BBC Test Match Special
South Africa will be eyeing up around 380. They know they can. They'll want to make that kind of statement.
Australia also look really flat.
De Kock 108, Markram 7
Australia continue with spin from one end as Glenn Maxwell replaces Adam Zampa.
Once again South Africa keep their powder dry, content to poke and prod the off-spinner into the gaps.
Here's how Quinton de Kock got to three figures a little while ago...
Firdose Moonda
Cricinfo writer on BBC Test Match Special
It has been really good from South Africa. They are keeping it moving nicely and I know they have spoke about not letting the middle overs drift.
I suspect they'll really put their foot down after 32 overs.
A quick bit of liquid refreshment in Lucknow.
Members of the Cummins family, look away now.
Australia ditched Alex Carey for Josh Inglis for this match. You wouldn't know it from listening to his Aussie twang but Inglis was born in Leeds. He actually played for Yorkshire's youth teams from 11 to 14.
He's a Coventry City fan, apparently. His English parents enjoyed their holidays to Australia so much they decided to move there permanently when he was 14.
Four runs off that Pat Cummins over.
UltraEdge shows no bat involved.
A review more in hope than expectation. Pat Cummins did not seem to want to review but agreed to do so.
Signs of Australia cracking up here?
Jonathan Agnew
BBC cricket correspondent on Test Match Special
This is a bizarre one. Pat Cummins is already walking back to his mark. He's not remotely confident.
A curious review for Australia after Quinton de Kock attempts to finely cut Pat Cummins.
Is there an edge here?
Australia wicketkeeper Josh Inglis was the most interested.
Firdose Moonda
Cricinfo writer on BBC Test Match Special
I actually thought Quinton de Kock might be crying there. There was a little glint in the eye.