Thor actor Chris Hemsworth is in the house with his wife Elsa.

Wonder what his serve is like?

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Cilic is sliding into strokes, but Federer clicks up a gear and gets the better of the sixth seed.

The Swiss rattles into a punchy serve to hold.

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Cilic challenges what looks to be a Federer ace, but that's nailed the line.

Another ace for the Swiss, his 16th of the match, before he pops a back-tracking forehand long - 30-30.

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That clear everyone? Thought so.

Lovely winner from Marin Cilic, as he closes out the game with a backhand that had barely any backlift. Smart.

How does Federer do that? Just a flick of the wrist as the ball looks to have beaten him, coaxing it back into the court off his backhand and winning the point.

Cilic powers back to 30-30, and then Federer goes long.

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Piers Newbery
BBC Sport at Melbourne Park

A huge roar greets Cilic closing out the second set, this crowd want to see a contest to match last night's women’s final. Federer hasn’t been seriously tested so far in this tournament and he definitely lost his rhythm from the baseline towards the end of that set, the question is whether Cilic can keep his foot on the gas.

And I’m pretty sure the air conditioning has been turned up a notch...

Big service game coming up from Marin Cilic.

The Croat powers forward to the net and forces Roger Federer to go long, but it's the Swiss who gets the better of a lengthy backhand exchange.

15-15.

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Federer starts the third set with an ace. Of course he does.

Another one for 40-0 before he nets the next point.

He finds another big serve to overpower Cilic and it's a trademark quick hold for the Swiss.

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A third set point for Cilic.

He's levelled! A composed overhead smash from the sixth seed and he's taken the set.

Game on!

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Great pick up from Federer on the baseline, but an even better forehand winner from Cilic as he clips the line on the far side.

A big serve from Federer to claw one point back.

Federer slaps the net rather carelessly to take us to 4-4.

Cilic bounces the ball umpteen times and sends down a huge serve. Federer challenges the 'in' call and he's way off the mark. He didn't even look at the screen to see if his challenge was right!

Magnificent return from Marin Cilic to pick off Roger Federer's second serve. Ruthless.

The next one is wild, though, and the Croat wraps it well wide off the backhand side.

A tricky little backhand on the volley completely wrong-foots Federer. Cilic levels.

But the Swiss pulls ahead again by coming into the net for a forehand winner.

Roger Federer pops a couple of let calls down... and then an ace, followed by another.

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Cilic's first serve is a dud.

On his second, the pair battle on the backhand and Federer shoots over the baseline.

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That's framey and long from Cilic, followed up by a Federer ace.

Tie-break time.

That first set was wrapped up in 25 minutes. The second is approaching double that.

Marin Cilic pops a backhand from the baseline long, and then lashes a return into the depths of the net.

30-0.

Federer can't coax another whipped Cilic second serve beyond the tape, and the Croat grunts into a huge ace to follow.

He holds to love.

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Punchy, aggressive strokes from Cilic as he saunters into the net and forces Federer into a mistake - 30-0.