Korea's Chung beats Djokovic 6-7 (4-7) 5-7 6-7 (3-7)
Djokovic struggling with elbow injury in fourth-round match
World number 97 Tennys Sandgren beats fifth seed Dominic Thiem
Halep beats Osaka to reach last eight
Federer wins in straight sets
Kerber and Keys also through
Well, that's just about all from us as we head off to try and catch our breath after that thriller.
Same time tomorrow? You bet.
After you've caught up on your daily dose of Australian Open action via the links below, why not stick the alarm on for 03:30 GMT and join us for Kyle Edmund's quarter-final clash against third seed Grigor Dimitrov?
We'll see you then...
BBC Two
And don't forget, you can watch the highlights from Monday's last-16 matches on BBC Two at 16:45 GMT.
Well, Hyeon Chung knocking out six-time champion Novak Djokovic is just another shock in what has been a quite memorable Australian Open so far.
If you missed any of today's action, then we've got you covered. Here are a few of the highlights...
David Law
Radio 5 live sports extra commentator at Melbourne Park
Djokovic made Chung spill every ounce of sweat for that victory and the Korean had all the answers.
Chung beats Djokovic in straight sets
Hyeon Chung will face Tennys Sandgren in the quarter-finals after the American's shock victory over fifth seed Dominic Thiem.
How will the 21-year-old from South Korea prepare for that one?
"I need a good recovery," said Chung. "A good sleep and I'll be ready for Wednesday."
Hyeon Chung, being interviewed by Jim Courier after his victory: "I didn't know how I'd win this tonight. I was just honoured to play against Novak, and happy to see him back on the tour. I try to copy Novak in the way I play because he is my idol."
Image source, Getty ImagesDavid Law
Radio 5 live sports extra commentator at Melbourne Park
You do wonder, as Novak wanders off court, if he'll ever win this tournament again.
Image source, Getty ImagesDjokovic 6-7 (4-7) 5-7 6-7 (3-7) Chung
How about that?
Hyeon Chung sinks to the Rod Laver Arena surface, waves to the crowd and shakes Novak Djokovic's hands.
That was some match.
Djokovic 6-7 (4-7) 5-7 6-7 (3-7) Chung
He's done it! Unbelievable!
Novak Djokovic goes wide, and Hyeon Chung is into the quarter-finals.
Image source, Getty Images*Djokovic 6-7 (4-7) 5-7 6-6 Chung
A cracking serve, and Chung has three match points.
David Law
Radio 5 live sports extra commentator at Melbourne Park
YOU'VE GOT TO BE KIDDING ME!
Chung is most certainly the new kid on the block.
*Djokovic 6-7 (4-7) 5-7 6-6 Chung
Djokovic approaches the net, he thinks he's got Chung beaten... but the Korean slides to his right and whips a forehand beyond the Serb - magic!
5-3.
Djokovic 6-7 (4-7) 5-7 6-6 Chung*
The Rod Laver Arena is silent, before Djokovic cracks a powerful serve on to Chung's forehand side and the Korean can't poke it back.
Chung faces up to the next one, and Djokovic goes long.
4-3 Chung.
David Law
Radio 5 live sports extra commentator at Melbourne Park
Djokovic is probably thinking he's only been out of the game for six months - where has this guy come from?!
*Djokovic 6-7 (4-7) 5-7 6-6 Chung
Hyeon Chung clips the net, Novak Djokovic isn't finished yet.
The Korean's second service point is also dealt with by Djokovic, just... Chung did everything he could to stay in that point, sliding to his right to meet a punchy Djokovic stroke, but that's 3-2.
Image source, Getty ImagesDjokovic 6-7 (4-7) 5-7 6-6 Chung*
Magnificent from Chung, a huge forehand to send Djokovic sprawling - the Serb can't get near it.
Djokovic takes his time before a big second serve, but then whips a crosscourt backhand into the tramlines.
That's 3-0 Chung.
*Djokovic 6-7 (4-7) 5-7 6-6 Chung
Hyeon Chung forces Novak Djokovic wide and the Serb's response is too timid, it clips the net - 1-0.
David Law
Radio 5 live sports extra commentator at Melbourne Park
When Djokvoic is launching his big serves, the pain is visibly shooting up his arm. There's no way around it for him - he has to use that part of his arm!
Djokovic 6-7 (4-7) 5-7 6-6 Chung
Big serving from Novak Djokovic.
He holds.
Image source, Getty Images*Djokovic 6-7 (4-7) 5-7 5-6 Chung
Hyeon Chung is in the mood.
Novak Djokovic wobbles on his approach and the Korean has time to pick his spot with a thumping backhand.
The Serb rallies to 15-15. You can feel the nerves trickling out of Chung, he opts for a lob that is punished by the six-time champion at the net.