Postpublished at 18:37 British Summer Time 4 September 2018
*Stephens 2-6 3-5 Sevastova
One saved as Stephens slaps down a forehand winner.
Two saved as Sevastova goes wide from the back.
Summary
Serena Williams beats Karolina Pliskova to reach semi-finals
American 17th seed wins 6-4 6-3 at Flushing Meadows
Argentina's Juan Martin del Potro through to semi-finals on Friday
Third seed beats John Isner 6-7 (5-7) 6-3 7-6 (7-4) 6-2
2017 champion Sloane Stephens knocked out by Anastasija Sevastova
Latvia's Sevastova through to semi-finals with 6-2 6-3 victory
Rafael Nadal plays Dominic Thiem in the last match of day nine
Extreme heat policy in place as New York temperature causes problems
Postpublished at 18:37 British Summer Time 4 September 2018
Postpublished at 18:36 British Summer Time 4 September 2018
*Stephens 2-6 3-5 Sevastova
40-0 as Stephens' shot once again hits the netting.
Three match points.
Postpublished at 18:36 British Summer Time 4 September 2018
*Stephens 2-6 3-5 Sevastova
30-0 as Stephens finds the net with her return.
And now... the end is near...
Postpublished at 18:35 British Summer Time 4 September 2018
Stephens 2-6 3-5 Sevastova*
Sevastova then comes out with another trick sliced drop to break.
She will now serve to book a place in the US Open semi-final.
Postpublished at 18:34 British Summer Time 4 September 2018
Stephens 2-6 3-4 Sevastova*
Another wondrous drop from Sevastova following a bout of looped baseline bandits brings up break point.
Postpublished at 18:33 British Summer Time 4 September 2018
Stephens 2-6 3-4 Sevastova*
Sevastova does look like she's about to cry as Stevo slaps down a winner.
The American goes long once more.
Deuce Bigalow.
This is a seven-minute game so far.
Postpublished at 18:32 British Summer Time 4 September 2018
Stephens 2-6 3-4 Sevastova*
Here's Stephens' chance to hold..
But she goes long.
Deuce part three.
Postpublished at 18:31 British Summer Time 4 September 2018
Stephens 2-6 3-4 Sevastova*
Sevastova goes long - it looked in.
Break point saved.
Deuce.
The Latvian then goes wide.
She looks a little distraught.
Postpublished at 18:30 British Summer Time 4 September 2018
Stephens 2-6 3-4 Sevastova*
Stephens then goes long with a forehand after an energy-sapping 14-shot rally.
Deuce.
Advantage Sev!!!!!!
Extraordinary!
Postpublished at 18:29 British Summer Time 4 September 2018
Stephens 2-6 3-4 Sevastova*
A good first serve forces Sevastova to drive into the net.
The American then flashes a forehand winner which the Latvian challenges - the computer says she was wrong.
30-0.
A turnaround?
It should have been 40-0 but Stephens inexplicably finds the netting with a tap-smash at the net.
30-15.
Sev then makes an error before she comes to the net to slap down a winner.
Strange game, this.
40-30.
Postpublished at 18:26 British Summer Time 4 September 2018
David Law
BBC Radio 5 live sports extra commentator at Flushing MeadowsSevastova has suddenly forgotten how to play tennis. She looks like a park player.
Stephens breaks once morepublished at 18:25 British Summer Time 4 September 2018
*Stephens 2-6 3-4 Sevastova
Stevo break back again as Sev hits the net with a double hander.
The Latvian had the jitters and paid the price.
The players are back on their chairs and applying the "ice sausages" - that was the term used by Stephens in the pre-match interview.
Postpublished at 18:23 British Summer Time 4 September 2018
*Stephens 2-6 2-4 Sevastova
Sevastova goes long - 0-15.
She gestures to her box again, which she did when she made errors in the first set.
The Latvian goes long again.
0-30.
She then hits the net.
0-40.
Three break points for the defending champion.
Postpublished at 18:21 British Summer Time 4 September 2018
Stephens 2-6 2-4 Sevastova*
Sev isn't moving much in this game but she still manages a brilliant dipping forehand winner.
40-15.
Stephens holds.
She must strike now.
Postpublished at 18:20 British Summer Time 4 September 2018
Stephens 2-6 1-4 Sevastova*
A Sev slice hits the net - a rare mistake with that shot.
She then goes wide with a return.
30-0.
Maybe the Latvian is easing off - she's a break up, so we can't blame her.
40-0.
Stephens frustratedpublished at 18:18 British Summer Time 4 September 2018
*Stephens 2-6 1-4 Sevastova
15-0 - Stephens yells out something in frustration again. I think she said a rude word.
30-0.
Then another drop-shot to the forehand side of Stephens which the American can't return.
40-0.
Love hold as Stevo adds another to her 'unforced errors collection'.
This is so easy, unexpectedly so, for Sevastova.
Postpublished at 18:17 British Summer Time 4 September 2018
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extraStephens is either struggling with the heat or nerves. Those two things are so damaging for the footwork. She hasn't been nervous in the tournament so my first guess wouldn't have been that.
Sevastova breaks againpublished at 18:15 British Summer Time 4 September 2018
Stephens 2-6 1-3 Sevastova*
One saved with a great forehand.
Can she save the next?
No. She did messed up in style with an ugly double hander that went wide.
Stevo is down on her haunches and a break down again.
Postpublished at 18:14 British Summer Time 4 September 2018
Stephens 2-6 1-2 Sevastova*
15-0.
Sevastova moves forward metre-by-metre before punching down a winner.
Oh dear!
15-40.
Two break points!
Stephens breaks backpublished at 18:09 British Summer Time 4 September 2018
*Stephens 2-6 1-2 Sevastova
Stephens then produces another forehand winner that lands in the corner - that's the third time she's down that on that side.
Break point.
Sevastova then goes long!!
The American lets our a roar.
She could do with holding now.