Stefanos Tsitsipas beats champion Roger Federer to reach quarter-finals
20-year-old Greek fights back to win 6-7 (11-13) 7-6 (7-3) 7-5 7-6 (7-5)
Second seed Angelique Kerber stunned 6-0 6-2 by Danielle Collins
Fifth seed Sloane Stephens loses to Anastasia Pavlyuchenkova 7-6 (7-3) 3-6 3-6
World number two Rafael Nadal beats Tomas Berdych 6-0 6-1 7-6
*Federer 7-6 (13-11) 6-7 (3-7) 2-3 Tsitsipas
Honestly, Stefanos Tsitsipas has such a huge forehand behind him.
He runs around and whacks it cross-court for 30-15, and then the Greek ends up on the floor as he wins a mini-battle at the net with Federer.
Ace! Tsitsipas holds.
Federer 7-6 (13-11) 6-7 (3-7) 2-2 Tsitsipas*
Tsitsipas hasn't had a break point on the Federer serve yet.
Federer has had 10. He's missed them all.
Federer 7-6 (13-11) 6-7 (3-7) 2-2 Tsitsipas*
Serve and volley from Federer puts him game point up...
... oh, and the Swiss makes a stunner of a backhand down the line to hold!
*Federer 7-6 (13-11) 6-7 (3-7) 1-2 Tsitsipas
Tsitsipas and Federer eye up each other's backhands, before Tsitsipas changes it up with a huge forehand that Federer nets.
Hello. Federer's forehand decides it doesn't want to work properly, and we're at deuce.
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*Federer 7-6 (13-11) 6-7 (3-7) 1-2 Tsitsipas
Federer's forehand has temporarily wandered off.
Another hoick into the net takes Tsitsipas to 30-0 and some divine defence at the net allows him to hold.
Federer 7-6 (13-11) 6-7 (3-7) 1-1 Tsitsipas*
Backhand meets backhand in a mini-rally, before Federer slides forwards and thwacks a volley down.
Tsitsipas is on the board as he surprises Federer with a return of serve, forcing the Swiss to dump the ball down at his feet, but a long forehand ensures the Swiss holds.
*Federer 7-6 (13-11) 6-7 (3-7) 0-1 Tsitsipas
A couple of errors from both players, Tsitsipas missing a swipe down the line after Federer whacks a forehand long, but the Greek closes out with a stonking forehand.
Cilic 7-6 (8-6) 3-6 2-6 6-4 4-6 Bautista Agut
The winner of this match will face Roberto Bautista Agut, who has come through another epic to reach the last eight of a Grand Slam for the first time.
The Spaniard beat sixth seed Marin Cilic in five sets - this match taking a mere four hours.
Bautista Agut beat Andy Murray in the first round, and has now played 18 sets over four rounds.
He's going to enjoy his day off before Tuesday's quarter-final.
Image source, EPAFederer 7-6 (13-11) 6-7 (3-7) 0-0 Tsitsipas*
Stefanos Tsitsipas will serve first to start the third set.
Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 live sports extra
We've had two hours of high-quality tennis. Neither of them have dropped their standards since the start.
I would have given the edge to Federer because of the constant pressure he was able to pile on Tsitsipas' shoulders but the young Greek was able to absorb the pressure.
Federer 7-6 (13-11) 6-7 (3-7) Tsitsipas
Stefanos Tsitsipas saved four set points, forced a tie-break, then converted his first set point to draw level with the defending champion.
It's been some match.
Federer 7-6 (13-11) 6-7 (3-7) Tsitsipas
What a way to take the set!
Into the corner of the court flies a Stefanos Tsitsipas forehand, and he clinches the second set on his first set point.
Image source, EPAFederer 7-6 (13-11) 6-6 (3-6) Tsitsipas*
Now then!
A volley from Roger Federer is long and it's three set points to Tsitsipas.
Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 live sports extra
Tsitsipas is absorbing the pace and power of Federer and quickly turning defence into attack.
*Federer 7-6 (13-11) 6-6 (3-5) Tsitsipas
Brilliant play from Stefanos Tsitsipas, forcing Federer onto the back foot and then smashing a big forehand winner.
*Federer 7-6 (13-11) 6-6 (3-4) Tsitsipas
Federer is pushed wide - and blazes his shot into the net!
Federer 7-6 (13-11) 6-6 (3-3) Tsitsipas*
Shot!
Down the line goes Federer with a glorious winner.
Even stevens.
Jonathan Jurejko
BBC Sport at Melbourne Park
Ouch! I would not like to be on the end of the stare which Federer is giving the line-judge. The Swiss stands motionless at the net, eyeballing the young man who called it out.
Image source, EPAFederer 7-6 (13-11) 6-6 (2-3) Tsitsipas*
A sprawling Tsitsipas sends a return out of bounds.
He's still got his nose in front...