US Open quarter-finals at Flushing Meadows, New York: Get involved: #bbctennis
Serena Williams overpowers Wang Qiang 6-1 6-0 in 44 minutes to reach semi-finals
GB's Johanna Konta loses 6-4 6-4 to Ukrainian fifth seed Elina Svitolina in women's quarter-finals
Daniil Medvedev beats Stan Wawrinka 7-6 (8-6 ) 6-3 3-6 6-1 in men's last eight
Roger Federer v Grigor Dimitrov follows Williams v Wang
Svitolina 6-4 2-2 Konta*
Konta produced some good work in that fourth game, but can't do enough of it as Svitolina holds on to that serve. The second set is proving as tense as the beginning of the first was.
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Dr Peter Hoare: Sorry who is John Poole (see 18:07 entry)? Never heard of him - how many Grand Slams has he won? “female Henman”? Give her a chance - many said the same about Andy Murray’s GS prospects.....
*Svitolina 6-4 1-2 Konta
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
Svitolina is solid from the back of the court, she chases everything and she puts pressure on you by sending so many balls back.
She's making Konta feel like she has to do more. Konta needs to do the things that break up Svitolina's game with more conviction.
Svitolina has made it difficult for her, but this has been a good start to the second set by Konta and if she can get a break and get her nose in front it could make all the difference.
Image source, Reuters*Svitolina 6-4 1-2 Konta
A reminder that Johanna Konta has never beaten Elina Svitolina in their previous four meetings, although today is the first time they've played each other in a Slam.
If Konta plays more shots like we've just seen, a cracking two-handed backhand down the line, then she will have a chance.
*Svitolina 1-2 Konta
An ace out wide - Konta's third ace of the match - followed by a slight fist pump brings the third game of the second set to a quick conclusion. Just like set one, no early chances for a break on either side, yet.
Image source, Getty ImagesSvitolina 1-1 Konta*
Elina Svitolina quickly levels us at 1-1 in this second set.
*Svitolina 6-4 0-1 Konta
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
Svitolina needs to make sure she's making the first serves and not let Konta get ahead of her in this second set.
Konta needs to use the variety a little more. The drop shots have worked well, Svitolina is comfortable at the back of the court and you need to pull her off the baseline with the drop shots and tight angles.
*Svitolina 6-4 0-1 Konta
Here is French tennis player Gael Monfils cheering on partner Elina Svitolina and he will be liking what he's seen so far.
Image source, Reuters*Svitolina 6-4 0-1 Konta
A service hold to love from Johanna Konta is just what she needs to erase any negativity from losing set one.
Svitolina 6-4 0-0 Konta*
Jonathan Jurejko
BBC Sport at Flushing Meadows
What a volley from Konta! A stunned volley which had more backspin than a Tiger Woods approach.
Unfortunately it didn't help save the opener, a poor shot selection - and execution - handing over the second set point.
Svitolina 6-4 0-0 Konta*
John Poole: Think it's about time that people realised that Konta hasn't got a slam in her. Semis will always be as far as she will go. The female version of Henman.
Agree with John? Tell us your thoughts via #bbctennis.
Svitolina 6-4 0-0 Konta*
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
Svitolina was the slightly more consistent in that first set.
Her serve helped her when it needed to - and that's something she's not always been particularly big on.
You have to be playing well to get anything out of Svitolina. Konta had two bad misses, which came at the worst possible time for her.
Svitolina 6-4 0-0 Konta*
Konta, long and there goes the first set.
Not much in it, but Svitolina does enough and is halfway there to a semi-final against either seven-time champion Serena Williams or China's Qiang Wiang.
Konta knocked out third seed Karolina Pliskova in the last 16 after losing the opening set and she is going to have to go the distance again to keep her US Open adventure going on.
Image source, Getty Images*Svitolina 5-4 Konta
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
That was incredible.
It was a decent pass, finding Johanna Konta around the ankles but she left Svitolina with no chance of getting that ball back.
This is a crucial time.
*Svitolina 5-4 Konta
But here comes a second set point.
Image source, Reuters*Svitolina 5-4 Konta
A drop volley winner from Konta, controlling it perfectly, keeps this first set alive. One set point saved. Deuce.
*Svitolina 5-4 Konta
Svitolina with a set point after Konta can only parry a deep serve in the bottom of the net. 40-30.
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Some good multi-tasking from Dave.
England women's football team are currently 1-0 up in their friendly away against Norway and you can follow that one here.
Image source, TweetJonathan Jurejko
BBC Sport at Flushing Meadows
"Come on!" shrieks a fist-clenching Konta as she holds.
Svitolina will have to serve this one out...
Image source, Getty Images*Svitolina 5-4 Konta
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
Konta is going to have to take her chances here. She can't afford to give away any cheap points against Svitolina.