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
*Dimitrov 4-4 Edmund
Kyle Edmund breaks Grigor Dimitrov's run with two cracking serves that swing past the nose of his opponent.
A stonking forehand, hit like Edmund is trying to smash the ball in half, gets him in front, but Dimitrov plays some fine strokes from deep behind the baseline to give him a reminder.
Image source, ReutersDimitrov 4-3 Edmund*
Quick feet from Kyle Edmund! He gets forward as a Grigor Dimitrov forehand skims the top of the net, and Edmund can get a return over that Dimitrov nets.
Successive Edmund backhands find the net, and Dimitrov gets his nose in front for the first time.
*Dimitrov 3-3 Edmund
Hmm. Kyle Edmund handed Grigor Dimitrov a way back in there - three unforced errors in a row doesn't help matters.
*Dimitrov 3-3 Edmund
Long rally, and it's Grigor Dimitrov who comes out on top as Kyle Edmund's forehand drops beyond the tramlines.
Break point - and Edmund's forehand goes astray once again! We're back on serve.
Image source, EPA*Dimitrov 2-3 Edmund
The first real sticky moment for Kyle Edmund as he drifts long with his forehand, but a lovely backhand sends Grigor Dimitrov sprawling, and the Brit crashes a forehand over.
A backhand winner puts Edmund in front, but he picks an inopportune moment to double fault.
Dimitrov 2-3 Edmund*
Piers Newbery
BBC Sport at Melbourne Park
You know it's a big day for British tennis when the familiar face of Tim Henman looms over Rod Laver Arena on the big screen, the four-time Wimbledon semi-finalist sporting a pair of sunglasses in the front row alongside Wimbledon chairman Philip Brook.
Dimitrov 2-3 Edmund*
Grigor Dimitrov whizzes his way to a love hold, as Kyle Edmund and that big forehand get a little over-enthusiastic.
Image source, Getty Images*Dimitrov 1-3 Edmund
It is some forehand that Kyle Edmund has.
Another winner goes pinging cross court, before a stunning shot down the line, the ball fizzing and spinning off the racquet, hands him an easy hold.
*Dimitrov 1-2 Edmund
David Law
Radio 5 live sports extra commentator at Melbourne Park
Dimitrov is odds-on favourite to beat Kyle Edmund today and that brings its own pressures. He hasn't always been that confident this week. It will be interesting to see how he handles this.
Dimitrov 1-2 Edmund*
That's better from Grigor Dimitrov, coming up to the net and popping his backhand over, but a horrid double fault takes proceedings to 15-15.
A scorching backhand winner from Dimitrov draws a cry of appreciation from his opponent, and the Bulgarian holds.
It's already been a good day for the underdog.
Elise Mertens, ranked 37th, has knocked out fourth seed Elina Svitolina with a dominant performance on the Rod Laver Arena to reach the semi-finals in Melbourne.
The Belgian powered to a 6-4 6-0 victory in one hour and 13 minutes, hitting 26 winners to Svitolina's 14 and looking in total control.
The 22-year-old, who has yet to drop a set in Melbourne, will play either Caroline Wozniacki or Carla Suarez Navarro in the last four.
Image source, Getty Images*Dimitrov 0-2 Edmund
First ace of the match, as Kyle Edmund bends his back and cracks the ball down the T.
Edmund's targeting Dimitrov's backhand and it's working as an attempted slice drifts long. A speedy hold from the Brit.
Dominic Inglot
British doubles player on Radio 5 live sports extra at Melbourne Park
It looks like Dimitrov is the unsteady player at the moment and it's important that Edmund takes care of this service game and consolidates the break. A few first serves would be lovely.
Dimitrov 0-1 Edmund*
Right then. Here's Kyle Edmund to try and consolidate that early break.
Dominic Inglot
British doubles player on Radio 5 live sports extra at Melbourne Park
Kyle's got to make sure he imposes himself early and disguise any nerves, or not do anything to bring them out.
Dimitrov 0-1 Edmund*
Nice. Up to the net comes Edmund and he pops a forehand back over with Grigor Dimitrov camped behind the baseline.
Oh, and Dimitrov drifts long with his backhand! What a start for Kyle Edmund.
Dimitrov 0-0 Edmund*
A slip from Grigor Dimitrov gives Kyle Edmund an opening, but the Bulgarian recovers to swat a forehand over, and Edmund nets his return.
Double fault from Dimitrov! Hmm. Back to 40-40.
Dimitrov 0-0 Edmund*
A bit too much oomph on that forehand from Kyle Edmund, and Grigor Dimitrov gets back to parity.
Dimitrov 0-0 Edmund*
Woah. A shimmy to the left for Kyle Edmund and he batters that massive forehand at Grigor Dimitrov, who spears the ball into the crowd.
A pacey serve gets Dimitov back on track, but a little bobble off the net allows Edmund to fizz a winner down the line. Here's break point.
* denotes next server
Dimitrov v Edmund
Grigor Dimitrov has come out on top in this pair's previous two meetings, both of which have been on hard courts.
It'll be the Bulgarian to serve first on a sunny afternoon in Melbourne.