Better, better from Federer!

A terrific move forward is almost cancelled out by a odd smash from Fed, but Millman goes long, and Federer extends his lead...

Just long goes the Millman backhand....

And now long goes the forehand!

A sprawling Federer somehow returns Millman's superb first serve, but that's a nonsense of a backhand on the baseline, and Federer nets.

John Millman will serve first in the tie-breaker.

Two game points to Federer...

...oh, and what a dab at the net to close it out!

Hiya, tie-break.

Roger Federer is doing all the running, and he's lucky that John Millman whirls a drop shot just into the net. Millman smiles and has a furious word with himself.

That's a poor volley from Federer though, trying to pick the ball off his toes and instead hammering it into the netting, before a serve out wide takes him to 30-15.

John Millman is a game away from taking a two set lead over Federer.

Here's Roger, serving to stay in it...

Horrid miss from Federer on the forehand, and he's handed game point to Millman.

Shot! Millman holds with a lovely no-look backhand!

Block return from Federer - and it's long!

Hello, deuce.

A shank from John Millman - and it's long!

Break point to Federer.

That's an absurdly good flick at the net from John Millman, the ball landing right on the tramlines, and a surprised Roger Federer sends his lob long.

Ooh, ouch. Millman trips into just his second double fault of the match to get Federer on the board at 30-15 and there's an emphatic shout from Federer as the Australian pushes a backhand long.

30-30.

A winner, a couple of just long backhands from Millman, and Federer holds to love.

All square. Are we heading to tie-break territory?

Right then, Rog.

What you got?

Roger Federer's backhand has temporarily gone away again, as he blats his 26th unforced error into the net.

Federer's going too hard at these John Millman second serves - he's almost stood next to the ballkids to take this serve - and Millman races to a love hold.

He's a game away from a two set lead...

A great backhand from Federer, the ball just dipping over the top of the net, helps him slice his way out of a rally to take a 15-0 lead.

Oh! A gorgeous lob from John Millman lands right on the baseline - Federer thought it was going to drift long - keeps him in it, but Federer sends back-to-back winners past Millman to hold.

This is better from Federer, but he's only just starting to match Millman's level...

A clean John Millman winner hurries him to a 30-15 lead, and while Federer keeps himself in touching distance, he nets a backhand to hurry Millman to a hold.

In other news, Stefanos Tsitsipas, the year-end ATP Finals champion, the conquerer of Federer last year, is out! He's lost in straight sets to Milos Raonic! Didn't see that coming...

Roger Federer grumbles his way to a 30-15 lead but John Millman's determination to run around and chase down everything sees us go to 30-30.

Ooh! So close to a winner for Millman from a chipped backhand, but it's just, tantalisingly long, and Federer holds.

* denotes next server

Into the net goes Federer's return of serve and the advantage goes towards Millman.

And Millman holds as another return goes long! Fine stuff.

Shot! Roger Federer stutters into an approach at the net and he watches a John Millman forehand get blasted past him for a winner.

Now it's Federer's turn to unfurl a passing winner, this time off the backhand, to force proceedings to 30-30 but Federer burns a challenge on a cross-court shot that he can't quite believe he's missed.

Game point, Millman - but that's a superb move to the net by Federer, which for all intents and purposes looked like a real mess, and we go to deuce as Millman's lob is just long.

Roger Federer gets on the board with an ace before John Millman says sorry several times to a ballkid who he asks to move out of his eyeline. Such a silly thing but I love when the players are so polite to the kids.

Federer, incidentally, has won just five points on his second serve. He nails his first one out wide for a 40-15 and a one-two punch hurries him to a hold.