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Live Reporting

By Emma Sanders and Alex Bysouth

All times stated are UK

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  1. Until tomorrow...

    Konta

    After a cracking few matches we are going to leave things here for the day.

    Don't forget you can keep up to date right across the BBC Sport website with everything going on into the early hours at Flushing Meadows.

    Johanna Konta fans might want to keep a keen eye on that match between Elina Svitolina and Madison Keys, with the winner facing the British number one next.

    We'll catch you next time...

  2. Osaka first on Ashe on Monday

    Naomi Osaka

    The order of play for the show courts on Monday is already out and defending champion and world number Naomi Osaka will open play on the Arthur Ashe Stadium, when she faces 13th seed Belinda Bencic in the last 16 at 17:00 BST.

    They'll be followed by Alexander Zverev against Diego Schwartzman.

    Rafael Nadal and Marin Cilic will open the night session with Bianca Andreescu and Taylor Townsend to come after them.

  3. Over in the doubles...

    Meanwhile over in the men's doubles, Britain's Jonny O'Mara and partner Marcelo Arevalo from El Salvador are out following a 3-6 6-3 6-4 defeat in the fourth round to German 12th seeds Kevin Krawietz and Andreas Mies.

    Compatriots Jamie Murray and Neal Skupski, seeded 15th, are a set and a break up against Canadian Denis Shapovalov and Indian Rohan Bopanna.

    Britain's Joe Salisbury, with American teammate Rajeev Ram take on eighth seeds Marcel Granollers and Horacio Zeballos shortly.

    And American teenager Coco Gauff, who was knocked out of the singles draw by world number one Naomi Osaka last night, is in action in the women's doubles.

    She is a set up alongside teenage American partner Catherine McNally. They are up against the ninth seeds Nicole Melichar of the US and Czech Kveta Peschke.

  4. Post update

    Courtney Nguyen

    WTA reporter at Flushing Meadows

    Would I make Serena the favourite? I like her draw better now than I did at the start of the day (Ashleigh Barty having been knocked out by Wang Qiang).

    It's not the easiest of draws. Now she plays Wang Qiang. There's a part of me that thinks you really have to underline Bianca Andreescu. She's getting the job done.

  5. 'This is for all the parents'

    Williams 6-3 6-4 Martic

    More from Serena, on giving birth two years ago today: "She was in my arms by now. It was amazing and the best day of my life. Now she is getting a little bit older she is starting to understand - she sees me on TV and says 'Mamma!' - sometimes she sees Venus and she says 'Mamma!'.

    "I honestly feel so fortunate to be out here playing as a mum, and I know there are so many mums - and dads - out there working.

    "It's crazy because it's so hard to go to work, come home and be a full-time parent. When I go to bed now at 9pm, I am exhausted. Kudos to all the parents out there. This is for you guys.

    "Pressure is a privilege and I am privileged to have that pressure."

  6. 'I rolled my ankle'

    Williams 6-3 6-4 Martic

    Here is Serena Williams: "I just rolled it (my ankle) I don't know why, I was volleying and it just went over - that was frustrating but I wanted to get it compressed really fast.

    "It affected me a little mentally because I've had a rough year with injuries. I'm finally walking, but you guys were out here cheering so hard.

    "It really means a lot. It's a special place for me, so thank you so much."

  7. Post update

    The on-court interviewer has just described Serena Williams as "everybody's Superbowl".

    "You are always their biggest match". What a great analogy!

  8. Post update

    Williams 6-3 6-4 Martic

    Up next for Serena?

    Chinese 18th seed Wang Qiang, who knocked out second seed Ash Barty earlier today in straight sets.

    A certain Johanna Konta is in her side of the draw and the two would meet in the semi-finals should they come through their next matches.

    .
  9. Post update

    Courtney Nguyen

    WTA reporter at Flushing Meadows

    She goes into that quarter-final with a good head of steam - 37 winners and 19 unforced errors is a big margin. She's playing better with each round and gaining confidence.

  10. Game, set and match

    Williams 6-3 6-4 Martic

    ACE.

    Serena Williams is into the US Open quarter-finals.

  11. Post update

    *Williams 6-3 5-4 Martic

    A fist pump from Williams as she fires a forehand winner into the corner. Two cross-court winners follow and she has two match points.

  12. Martic holds

    *Williams 6-3 5-4 Martic

    Martic flicks her necklace around irritably as she skews a forehand into the net at 30-15. Williams punishes her with a volley into the court.

    An 11-shot rally breaks out with slices, drop shots and a lob but it drops over the baseline from Williams.

    Martic holds with an ace and Williams will have to serve for the match.

  13. Post update

    Williams 6-3 5-3 Martic*

    This was how Williams looked after rolling that right ankle after breaking in this set. She is soldiering on and is now a game away from the quarter-finals.

    Serena Williams
  14. Williams holds

    Williams 6-3 5-3 Martic*

    What a rally! After 22 shots, Martic pulls off a stunning backhand slice and turns back to the baseline with a wry smile.

    Williams responds with a fizzing serve out wide (30-15) and another one which is unreturned (40-15). She holds with an ace.

  15. Get Involved

    #bbctennis

    Ian Robbins: Serena playing superbly. Very worried about how that ankle could shape up though once it has time to swell/stiffen and the adrenaline stops pumping through.

  16. Martic holds

    *Williams 6-3 4-3 Martic

    An unforced error from Martic on the backhand - advantage Williams. But another skewed forehand.

    Back to deuce.

    An unreturned serve. Advantage Martic...

    And game Martic! A very good hold.

  17. Post update

    Williams 6-3 4-2 Martic*

    One down. Williams' forehand is poked wide. Another wobble on that ankle...

    Two down. Williams' forehand drops inches over the baseline.

    Three down! Williams is stretching for the drop shot and plants a forehand long.

    Deuce.

  18. Post update

    Williams 6-3 4-2 Martic*

    "ARGH!" Williams screeches as she slams a volley into the open court. And suddenly, there's three break points.

  19. Post update

    Courtney Nguyen

    WTA reporter at Flushing Meadows

    Martic definitely doesn't want to give up cheap points.