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
Simon Briggs
Daily Telegraph tennis correspondent on BBC Radio 5 live sports extra
I don't think Kyle's played lights out, but he's kept the pressure on with the forehand. It's drained Dimitrov's confidence. He must be feeling the pressure as the favourite before this match.
Dimitrov 4-6 6-3 3-6 2-3 Edmund*
Right then. Can Kyle Edmund hold his nerve, and back up his break?
Dimitrov 4-6 6-3 3-6 2-3 Edmund*
That was a terrible mis-step from Dimitrov - he was aiming down the line and ended up spearing the ball way out of play.
Coach Daniel Vallverdu looks at him like he can't believe what he's just done. Dimitrov doesn't look best pleased, either.
Dimitrov 4-6 6-3 3-6 2-3 Edmund*
A shank from Grigor Dimitrov! Kyle Edmund has the break!
Image source, ReutersDimitrov 4-6 6-3 3-6 2-2 Edmund*
Momentum swings this way and that, as Grigor Dimitrov outpaces Kyle Edmund with his serve, before Edmund cracks a winner into the corner of the court.
Now it's Dimitrov that falters! Into the net goes his attempted slash, and it's break point to Edmund...
*Dimitrov 4-6 6-3 3-6 2-2 Edmund
David Law
Radio 5 live commentator at Melbourne Park
You get the sense that this young man from Yorkshire is starting to believe he can be a Grand Slam semifinalist.
*Dimitrov 4-6 6-3 3-6 2-2 Edmund
Kyle Edmund's never beaten a top five player before.
He uses his first serve to fine effect before Dimitrov, scampering into the side of the court, slaps his backhand into the net. Edmund holds.
Image source, Getty ImagesDimitrov 4-6 6-3 3-6 2-1 Edmund*
A steely-eyed Grigor Dimitrov batters his way to a love hold.
His forehand finds the corner of the court with unnerving accuracy, and he pumps his fist towards his box.
*Dimitrov 4-6 6-3 3-6 1-1 Edmund
Nick Burd: C’mon @kyle8edmund outplaying Dimitrov to take the 3rd set, 2-1 up!!! Finish it off Kyle!!!!
Frances Anderson: Impressive stuff from @kyle8edmund it’s your time!
*Dimitrov 4-6 6-3 3-6 1-1 Edmund
There's rounds of applause for Kyle Edmund as he induces the error out of Grigor DImitrov's backhand, the Bulgarian slicing the ball into the foot of the net.
Another stonking forehand is hit with pinpoint accuracy and, just like that, Edmund holds.
Dimitrov 4-6 6-3 3-6 1-0 Edmund*
Grigor Dimitrov struggling badly with his serve in the third set - he landed only 39% of his first serves. Edmund found the mark with 68% of his.
Dimitrov 4-6 6-3 3-6 1-0 Edmund*
A speedy hold for Grigor Dimitrov, faltering only with a forehand that drifts long.
It all feels a bit tense out there.
*Dimitrov 4-6 6-3 3-6 0-0 Edmund
Piers Newbery
BBC Sport at Melbourne Park
Well this is becoming a thing now. A huge cheer rings around Rod Laver Arena as Edmund takes the third set, and his explosive game seems to be winning plenty of new fans here this afternoon.
You have to wonder how his coach Fredrik Rosengren will cope with his man one set from a Grand Slam semi-final. The 57-year-old Swede is an extremely engaging individual, and cannot help but live every point from the player box. He's been leaning over the railing urging his man on since the start - Edmund said after his last match that it helps, and it certainly seems to be working today.
*Dimitrov 4-6 6-3 3-6 0-0 Edmund
Kyle Edmund has nipped off for a comfort break - he returns with a towel draped over his shoulders.
Grigor Dimitrov, meanwhile, has spent time sat in his chair, leg tapping about furiously. Here we go...
Dominic Inglot
British doubles player on Radio 5 live at Melbourne Park
Kyle has been serving really well, he has been dominating with that shot. He's been a little bit up and down with the forehand. Dimitrov's serve seems to be all over the place and he seems to be nervous. I don't whether that's expectation. Credit to Kyle because he is dominating this match.
#bbctennis
Mike Forsythe: I want to take Kyle Edmund's forehand out for a nice seafood dinner.
Daniel Seymour: I think Edmund has the skill to beat Dimitrov but he has to keep his head and not get frustrated
*Dimitrov 4-6 6-3 3-6 Edmund
There's still lots to do for Kyle Edmund but he showed some good nerve to hang in that set, and then take advantage when Grigor Dimitrov faltered.
Grigor Dimitrov will serve to get the fourth set underway.
Russell Fuller
BBC tennis correspondent at Melbourne Park
Dimitrov will be thinking 'how can I impose myself on the match?' because he certainly hasn't been able to do so so far.
Dimitrov 4-6 6-3 3-6 Edmund
There it is!
It's a quick serve from Kyle Edmund and Grigor Dimitrov slams his racquet down onto it, and the backhand floats out of bounds.
Edmund is a set away from the Australian Open semi-finals.
Image source, AFP*Dimitrov 4-6 6-3 3-5 Edmund
A thoroughly grumpy-looking Grigor Dimitrov comes cantering up to the net to volley a winner, before Edmund responds with an excellent winner of his own.
It's 30-30, feels like it might go either way - but it's Edmund who darts forward, meeting a bobble off the net and crashing the forehand over in response!