Nadal retires injured in final set - Cilic wins 3-6 6-3 6-7 6-2 2-0
GB's Edmund beats Dimitrov 6-4 3-6 6-3 6-4 to reach semi-finals
Edmund in last four of a Grand Slam for first time - will play Nadal or Cilic
Wozniacki v Suarez Navarro to follow
Mertens stuns Svitolina 6-4 6-0 to reach last four
*Nadal 6-3 3-6 3-3 Cilic
Marin Cilic's box all applaud in unison as he pops the ball over the net to outsmart Nadal for 30-0.
He goes on to hold to 15. Steady as he goes.
*denotes next server.
Nadal 6-3 3-6 3-2 Cilic*
There's an almighty screech from one of the line judges, who thinks a Nadal hit has gone long. It didn't so the point is replayed and the chair umpire actually says sorry to the world number one.
Nadal goes on to hold to love, which is exactly what he needed.
*Nadal 6-3 3-6 2-2 Cilic
Ace, double fault, ace. You can't say that Marin Cilic doesn't like to mix it up.
He holds to level the set again.
Gigi Salmon
Radio 5 live sports extra commentator at Melbourne Park
Marin Cilic's shirt is a little short. It's like someone has put it in the wash and shrunk it.
*Nadal 6-3 3-6 2-1 Cilic
Cilic looks like he's cruising along to an easy hold before he needlessly pops a volley over the baseline. He's completely overcooked that.
He makes himself feel a bit better with a ninth ace for 40-30, but then double faults for deuce.
Hummmmmmmmm....
Nadal 6-3 3-6 2-1 Cilic*
Image source, AFPA big, big hold for Nadal. On we go...
Nadal 6-3 3-6 1-1 Cilic*
After throwing down an ace to open the service game, Cilic hits a forceful, clean forehand to overpower his Spanish opponent.
All of a sudden, he gets a break point. Just the one...and it's gone when the Croat shoots long.
Same again on the next point. Advantage Nadal.
That goes away too when the top seed nets. Gaaah.
*Nadal 6-3 3-6 1-1 Cilic
Marin Cilic is being very vocal on court, having recovered from 15-30 to hold.
Is Rafa nervous? Should he be nervous?
Image source, AFPMore good (but largely expected) news for Kyle Edmund, who is among five players named in Great Britain's Davis Cup squad for next week's World Group match in Spain.
The British number two, who has reached the Australian Open semi-finals, is joined by Cameron Norrie, Liam Broady, Jamie Murray and Dominic Inglot.
The first-round tie from 2-4 February will be broadcast live on the BBC.
"With it being played on their favoured clay surface it's going to be an incredibly tough first round," said GB captain Leon Smith.
"That being said, our team bring form into the tie and have nothing to lose."
Nadal 6-3 3-6 1-0 Cilic*
Here we go. Heeeerrrreeee we go.
A massive scream of "VAMOS" from Rafael Nadal as he pings a delicate drop over the net after a close-range battle of wits.
The world number one holds to stop the rot.
Those who haven't got a courtside ticket can watch via a big screen inside Melbourne Park. A nice spot for a hazy Tuesday evening.
Image source, AFP*Nadal 6-3 3-6 Cilic
This is only the second set Marin Cilic has taken off Rafa Nadal in their past four meetings. Cilic won the first set when the two met in Basel in 2015, but it's been one-way traffic since then.
Another thing of note...Cilic hasn't lost a game since having a spat with the chair umpire. That's the way to channel your anger!
Nadal's gone for a quick comfort break to get his head back in the game.
*Nadal 6-3 3-6 Cilic
Image source, Reuters"Got it," shouts Cilic as he lands his seventh ace for two set points.
One goes in the bin when the Croat spanks the ball into the net after a short rally.
But then he pulls out another ace. He's got the set!
Leon Smith
GB Davis Cup captain on BBC Radio 5 live sports extra
Cilic really believed and stood firm in his game plan. He's been very offensive and it's paid off for him. He's taking time away from Rafa and forcing him to play a little late.
Nadal 6-3 3-5 Cilic*
The Spaniard lands a forehand into the net. Cilic earns another break point.
The pair enter a rally and as Nadal tries to backhand and pirouette back to centre, the ball fails to drop over.
The world number six will serve for the set. Wowzers.
Leon Smith
GB Davis Cup captain on BBC Radio 5 live sports extra
This last 20 minutes, Nadal has come down a gear or two. There's not the same speed on his ground strokes.
Nadal 6-3 3-4 Cilic*
Cilic is looking strong and focused as he searches for another break.
Nadal sneaks into a 40-30 lead but then plonks the ball long for another trip to deuce.
*Nadal 6-3 3-4 Cilic
A comfortable hold for Marin Cilic to move ahead in this second set.
Two consecutive aces bring up a love hold.
Nadal 6-3 3-3 Cilic*
A waste of a break point opportunity from Cilic, as he lofts a poor forehand into the net.
He gets another chance, when Nadal scoops a bent forehand wide.
And he's got it! Now we've got a match on our hands.