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 4-3 Konta
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
That was a stunning pass from Svitolina. There were two bad misses from Konta in that game and another great rally in which Svitolina comes out on top.
Just when we thought there was some hope, Konta handed Svitolina some cheap points.
Svitolina 6-4 4-3 Konta
A lovely passing shot from Svitolina sees her instantly regain control of this set. Konta broke, and is instantly broken again, just as what happened in set one.
Svitolina now 4-3 ahead, two service holds from the final four. Konta back facing an uphill task once more.
Image source, Getty ImagesSvitolina 6-4 3-3 Konta*
Konta broke in the first set and was then immediately broken minutes later in the next game. This could be a case of deja vu as she's 0-40 down, Svitolina with three break points.
Svitolina 6-4 3-3 Konta*
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#bbctennis or text 81111 (UK only)
Johnny Bowe: To win a slam Konta needs to improve her mental side, do more intensity training and try a new coach, someone who coached a champion.
Svitolina 6-4 3-3 Konta*
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
Konta knows what she wants to do - it's just about doing that consistently.
I never saw that shot coming, it was a remarkable drop shot. Svitolina didn't see that coming at all.
A stroke of genius from Konta there.
Svitolina 6-4 3-3 Konta*
A beautiful drop shot, played perfectly, leaves Svitolina scrambling. She can only dribble the ball into the bottom of the net and the Ukrainian, knowing her second set advantage has just evaporated, swats the air in frustration.
Well played Johanna, and we're back on serve.
Image source, Getty Images*Svitolina 6-4 3-2 Konta
Konta with a break point after a Svitolina backhand finds the top of the net.
#bbctennis
David: Funny how there is often a reaction to beating a seed and playing a really good match. Same thing happened to Osaka. Let’s hope for a different outcome this time. Go Konta.
*Svitolina 6-4 3-2 Konta
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
Svitolina is a very gutsy competitor. She goes quietly about her business but she's a very determined player.
Image source, Reuters*Svitolina 6-4 3-2 Konta
We're at deuce in this game. Is this the start of the Konta fightback or a false dawn?
*Svitolina 6-4 3-2 Konta
Konta needs this one. She is 15-30 on the Svitolina serve. She won't get many more chances, but this is an opportunity to bring the second set back to all square.
*Svitolina 6-4 3-2 Konta
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
The thing Konta hasn't done as well as I expected her to is her serve.
Whether that's Svitolina being solid on the return or Konta not being as accurate, I'm not sure - but in the last few games we've seen the errors setting in.
You can't afford to do that against someone like Svitolina, she will make you pay. When Konta gets opportunities she must do something with them.
Image source, Getty Images*Svitolina 6-4 3-2 Konta
Why is Johanna Konta losing? Twenty-five unforced errors, compared to only 11 from her opponent, is a large reason why.
*Svitolina 6-4 3-2 Konta
It is a long way back now for the British number one. She is a set and a break down. She saved one break point but can't do the same when the world number five has a second chance.
Svitolina can see her first US Open semi-final in the distance.
Image source, Getty ImagesSvitolina 6-4 2-2 Konta*
Jonathan Jurejko
BBC Sport at Flushing Meadows
Svitolina senses a vulnerability in Konta's second serve.
With it down at 47%, the Ukrainian has stepped inside the baseline to try and punish it further.
#bbctennis or text 81111 (UK only)
Marcus Mee: Konta may not win a slam but that shouldn't be a stick to beat her with. Should be given more respect for getting to the sharp end of every slam...she's taking the brunt of there being no one else in touching distance.
Svitolina 6-4 2-2 Konta*
A backhand cross-court for Svitolina aiming for the break, but she puts too much power into it, it is out and Konta survives that one. Deuce.
Svitolina 6-4 2-2 Konta*
The unforced errors are starting to pile up from Konta. Break point for Svitolina 30-40.
Svitolina 6-4 2-2 Konta*
Judy Murray
Tennis coach at Flushing Meadows on BBC Radio 5 live sports extra
Svitolina has started to back off a little bit and I think that's because of the power Johanna Konta has started returning the ball with.
Konta needs to sense that and use it.
Image source, Getty Images