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Summary

  1. Fourth-round action
  2. Novak Djokovic beats Joao Sousa 6-3 6-4 6-3 to reach quarter-finals
  3. Djokovic will face Roger Federer next if the Swiss beats John Millman
  4. 2017 finalist Madison Keys beats Dominika Cibulkova 6-1 6-3
  5. Use play icon to listen to BBC Radio 5 live sports extra commentary
  6. GET INVOLVED: #bbctennis or 81111 (UK only)

Live Reporting

By Saj Chowdhury

All times stated are UK

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  1. Post update

    So, well done Djokovic, who appeared to overcome a bout of feeling unwell, to win his match in three sets and reach the last eight of the US Open.

    I wish I could shake off a cold like that.

    Thanks for reading.

  2. 'If I have time I'll watch the Federer match'

    Djokovic 6-3 6-4 6-3 Sousa

    More from Djoko: "I have imagine [I would get back to US Open quarters] but I'm not the only one. There are many players around the world who want to compete in Grand Slams. I'm lucky to have won 13."

    Will you watch [next opponent] Roger Federer play John Millman later?

    "We will first try to put the kids to sleep. It's family number one. If I have the time I will watch it."

  3. 'It was more difficult than the score suggests'

    Djokovic 6-3 6-4 6-3 Sousa

    Here's an ever-so-slightly revived Novak Djokovic: "I'm very happy to get this done in straight sets. It was much more difficult than the score indicated.

    "Joao brought a lot of intensity on the court. They were really tough conditions for the first hour or so."

    Were the conditions difficult?

    "I prefer not to talk about how difficult it was. We are blessed to play this sport and this is one of the biggest stages. I'm not 21 anymore. I still don't feel old but at the same time there is a biological clock that doesn't work in your favour like it does when your 20. You have a team to get you ready, but sometimes you just have to survive."

  4. 'No energy to celebrate'

    Gigi Salmon

    Radio 5 live sports extra commentator at Flushing Meadows

    There's no celebration from Novak Djokovic - he doesn't have the energy to celebrate.

  5. Post update

    Djokovic 6-3 6-4 6-3 Sousa

    I predicted the match would last a tad over two hours. I was wrong.

    It was one hour and 59 minutes.

    I resign.

  6. Game, set and match Djokovic

    Djokovic 6-3 6-4 6-3 Sousa

    40-30.

    First match point saved.

    Djoko takes the next by out-rallying his opponent who goes long.

    Sick or not, he was better than Sousa.

    Djoko is into the quarters.

  7. Post update

    Djokovic 6-3 6-4 5-3 Sousa*

    Hold the back page. At least for a few seconds.

    A Djoko error makes it 30-15.

    Actually, start printing.

    40-15.

  8. Post update

    Djokovic 6-3 6-4 5-3 Sousa*

    30-0.

    Djoko has won nine of the last 10 points.

    Victory in sight.

  9. Djokovic breaks

    *Djokovic 6-3 6-4 5-3 Sousa

    The first is taken as Djokovic presses the combo-move buttons by easing to the net and smashing home the winner.

  10. Post update

    *Djokovic 6-3 6-4 4-3 Sousa

    Djoko hits a great return to move to 0-15.

    Another double-handed backhand finds its target like Tessa Sanderson's javelin.

    He repeats the trick.

    Three break points.

  11. Post update

    Djokovic 6-3 6-4 4-3 Sousa*

    Did Keothavong think Sousa stopped because he thought the player had given up on the point?

    Where's Judge Rinder?

  12. Post update

    Djokovic 6-3 6-4 4-3 Sousa*

    40-15.

    Djoko then holds.

    Sousa is still complaining.

  13. Post update

    Djokovic 6-3 6-4 3-3 Sousa*

    Djoko isn't running much but he's still winning the points.

    30-0.

    Sousa then complains to umpire Keothavong that he gestured a challenge. The official says he stopped momentarily then carried on playing.

    The replay says Sousa was right.

    However, had he challenged Sousa would have lost.

    All's well...

    40-0.

  14. Osaka into first quarter-final

    Osaka 6-3 2-6 6-4 Sabalenka

    Over on Louis Armstrong Stadium, Japan’s Naomi Osaka has booked her place in the quarter-finals with a 6-3 2-6 6-4 victory over Aryna Sabalenka of Belarus.

    She needed four match points to finish the job.

    She will face the winner of the match between Marketa Vondrousova and Lesia Tsurenko in her first Grand Slam quarter-final. Neither of those are seeded, so the 20th seed must also fancy her chances of a first semi-final.

  15. Post update

    *Djokovic 6-3 6-4 3-3 Sousa

    A lovely double-handed backhand down the Central Line deservedly earns Sousa 30-0.

    Error 30-15.

    A good serve brings up 40-15.

    Sousa then sticks Djoko on a swinging plumb line before smashing home the game point.

  16. Post update

    Djokovic 6-3 6-4 3-2 Sousa*

    Djoko on his chair appears to squeeze a date through a hole in his tupperware box - I usually just open the lid.

  17. Post update

    Djokovic 6-3 6-4 3-2 Sousa*

    The world number six is still doing enough to make Sousa work.

    30-0.

    40-0 with a serve that Sousa flails long.

    Djoko holds.

    The Serb will be hoping he doesn't have to go searching for winners and that Sousa makes more errors.

  18. Post update

    *Djokovic 6-3 6-4 2-2 Sousa

    Djokovic goes down the line with a forehand with almost breaks the wrist of Sousa.

    30-30.

    Ace.

    40-30.

    Sousa then places a forehand beyond Djokovic's reach. Djoko at his peak would have got to that.

  19. Post update

    Djokovic 6-3 6-4 2-1 Sousa*

    Sousa comes out on top of a 13-shot rally as Djoko makes an error.

    The Portuguese player, who beat the seeded Lucas Pouille in the last round, takes the next point after the Serb fails with a challenge.

    Error Sousa - 15-30.

  20. Post update

    Djokovic 6-3 6-4 2-1 Sousa*

    He's back.

    That didn't take long.