Good morning! And welcome to the live coverage of the Australian Open quarter finals. First up, Rafa Nadal versus Marin Cilic.

That's all from us today from this match - thanks for joining us and we hope you're suitably excited by the semi-final line-up.

Nadal 6-3, 3-6, 7-6, 2-6, 0-2 Cilic: The injury curse of the top four continues, and Rafa is out of the tournament. Props to Cilic who played a strong game. He will now face GB's Kyle Edmund in the semi-finals.

Nadal 6-3, 3-6, 7-6, 2-6, 0-2 Cilic: Oh no! It's all over for Rafa as he just can't hang on any longer. The world no.1 looked to be really struggling their, and he's withdrawn injured.

Nadal 6-3, 3-6, 7-6, 2-6 CIlic: Yikes, it's gone horribly wrong for the world no.1 and he does look a little troubled by whatever the cause of his medical timeout was. We're at 2-5 in the Croatian's favour and Rafa hits the ball wide to give Cilic the fourth set.

Nadal 6-3, 3-6, 7-6, 2-4 Cilic: This is a worrying time for Nadal, Cilic initially goes 40-0 up before Rafa can get a break. He claws it back quickly, though, levelling with an audacious shot up at the net that makes it look so easy and comes back to hold.

Nadal 6-3, 3-6, 7-6 1-4 Cilic: That's a little medical timeout for Rafa, as Cilic starts to get a real hold on this match. The timeout seems to be slightly controversial, but he's breaking no rules here.

Nadal 6-3, 3-6, 7-6, 1-3 Cilic: There's a fist pump from Cilic as he sends a forehand juuuuust wide of Nadal at the service line. He's broken - tremendous effort.

Nadal 6-3, 3-6, 7-6, 1-1 Cilic: This is exceptionally tight. Cilic holds his first serve with no problem at all, and makes a strong challenge to break Nadal in the second game of the fourth set going 30-0 up at one point, with Rafa levelling after that pesky net gets in the way. Rafa holds.

Here's a look at how he did it...

Nadal 6-3, 3-6, 7-6 Cilic: Rafa is PUMPED as he just edges the third set after a hard-fought tie-break 7-5 in his favour. Huge roar from the crowd.

Nadal 6-3, 3-6, 6-5 Cilic: Flipping heck, it certainly looks like we might be in for a long morning/evening depending on your time zone. We are in a tie-break situation over in Melbourne.

Nadal 6-3, 3-6, 4-4 Cilic: To use words never used outside of sports journalism - have we got a "five-set-thriller" on our hands? Cilic lands another ace and holds.

Nadal 6-3, 3-6, 4-3 Cilic: Nadal defends two break points to hold but it's starting to look a bit more laboured.

A little look at how Cilic took the second set from our social media chums...

Nadal 6-3, 3-6, 3-3 Cilic: And Cilic holds... this could go either way. If Cilic were to win today, it would only be the second time he'd beaten Nadal in seven meetings.

Nadal 6-3, 3-6, 3-2 CIlic: Cilic is starting to look a little inconsistent, aces interspersed with double faults, Nadal holds to love.

Nadal 6-3, 3-6 Cilic: Unbelievable, from absolutely nowhere - or from nearly being somewhere, perhaps - Marin Cilic has completely turned this match on it's head. A comfortable hold by the Croatian and Nadal has taken his foot off the gas. Cilic breaks again and holds, signing off the set with an ace. Lovely stuff.

Nadal 6-3, 3-3 Cilic: Cilic has advantage and a real opportunity to stop the rot before it goes too far, but he nets the ball. He gets a second break point as Rafa hits it long, and that's it - he's done it and he's back in the game as the ball whistles past Rafa, just out of reach.

Nadal 6-3, 3-2 Cilic: Nadal has broken here in the second set in Melbourne and Cilic is NOT happy about it, as he gets called out for a time violation. Rafa is looking very good indeed here, and looking set to consolidate that lead.