Summary

  • 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

  1. Until next time...published at 11:52 Greenwich Mean Time 22 January 2018

    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...

  2. Don't miss it...published at 11:49 Greenwich Mean Time 22 January 2018

    BBC Two

    And don't forget, you can watch the highlights from Monday's last-16 matches on BBC Two at 16:45 GMT.

  3. Postpublished at 11:48 Greenwich Mean Time 22 January 2018

    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...

  4. Postpublished at 11:46 Greenwich Mean Time 22 January 2018

    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.

  5. Off for a good night's sleep...published at 11:43 Greenwich Mean Time 22 January 2018

    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."

  6. 'Novak is my idol'published at 11:40 Greenwich Mean Time 22 January 2018

    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."

    Players EmbraceImage source, Getty Images
  7. Postpublished at 11:38 Greenwich Mean Time 22 January 2018

    David 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.

    Djokovic_injury_3Image source, Getty Images
  8. Postpublished at 11:37 Greenwich Mean Time 22 January 2018

    Djokovic 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.

  9. game, set and match

    Game, set and match Chungpublished at 11:36 Greenwich Mean Time 22 January 2018

    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.

    Chung embraces crowdImage source, Getty Images
  10. Tie-breakpublished at 11:35 Greenwich Mean Time 22 January 2018

    *Djokovic 6-7 (4-7) 5-7 6-6 Chung

    A cracking serve, and Chung has three match points.

  11. Postpublished at 11:34 Greenwich Mean Time 22 January 2018

    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.

  12. Tie-breakpublished at 11:34 Greenwich Mean Time 22 January 2018

    *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.

  13. Tie-breakpublished at 11:33 Greenwich Mean Time 22 January 2018

    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.

  14. Postpublished at 11:31 Greenwich Mean Time 22 January 2018

    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?!

  15. Tie-breakpublished at 11:31 Greenwich Mean Time 22 January 2018

    *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.

    Chung_clips netImage source, Getty Images
  16. Tie-breakpublished at 11:29 Greenwich Mean Time 22 January 2018

    Djokovic 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.

  17. Tie-breakpublished at 11:28 Greenwich Mean Time 22 January 2018

    *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.

  18. Postpublished at 11:27 Greenwich Mean Time 22 January 2018

    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!

  19. Djokovic holdspublished at 11:27 Greenwich Mean Time 22 January 2018

    Djokovic 6-7 (4-7) 5-7 6-6 Chung

    Big serving from Novak Djokovic.

    He holds.

    Djokovic servesImage source, Getty Images
  20. Postpublished at 11:26 Greenwich Mean Time 22 January 2018

    *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.