Williams beats Kvitova 6-3 3-6 7-6 (7-2) to reach semi-finals
Roof closed during second set on Arthur Ashe Stadium
Stephens beats Sevastova 6-3 3-6 7-6 (7-4) to make last four
Carreno Busta beats Schwartzman 6-4 6-4 6-2 to make men's semis
Stephens 6-3 3-6 6-6 (3-3) *Sevastova
It's find your length from both players. Deep court is the spot to be, until Sloane Stephens attempts to mix it up, but Anastasija Sevastova responds with a neat recovery and then Stephens overcooks a forehand. That's long.
Stephens 6-3 3-6 6-6 (3-2) *Sevastova
The Arthur Ashe crowd groan.
Sloane Stephens with acres of court to aim into misses her forehand and the mini-break is snatched back by Sevastova.
All square.
*Stephens 6-3 3-6 6-6 (3-1) Sevastova
What an athlete Sloane Stephens is. Sevastova engages her in a rally but the American flings herself around the court and forces the Latvian to go long with some punchy forehands.
*Stephens 6-3 3-6 6-6 (2-1) Sevastova
Sloane Stephens gets her nose ahead with the first mini-break, cracking a fine forehand across court and out of the reach of Anastasija Sevastova.
*Stephens 6-3 3-6 6-6 (1-1) Sevastova
Anastasija Sevastova rattles a serve nice and wide, Sloane Stephens is stretching but can't hook that back on target.
All square.
Stephens 6-3 3-6 6-6 (1-0) *Sevastova
Sloane Stephens misses with her first serve. Into a rally we go, both players playing it safe.
Until Sevastova changes up a gear and screws wide.
Stephens 6-3 3-6 6-6 Sevastova
Pistols at six.
Anastasija Sevastova holds to love and we are into a decisive tie-break shoot-out.
Stephens 6-3 3-6 6-5 *Sevastova
Sloane Stephens stares right down the barrel. And doesn't blink.
She edges ahead on the scoreboard.
If she breaks in the next game, she wins.
If Sevastova holds, we are heading into a tie-break.
*Stephens 6-3 3-6 5-5 Sevastova
Jeff Tarango
Former professional tennis player on 5 live sports extra at Flushing Meadows
You know what they love in Queens? Drama.
Making unforced errors really hurts. You have got to keep that momentum when you get it.
*Stephens 6-3 3-6 5-5 Sevastova
Pressure? What pressure?
Anastasija Sevastova holds to love with a delicate drop-shot and anti-freeze in her veins.
Metaphorically of course.
Image source, Getty ImagesStephens 6-3 3-6 5-4 *Sevastova
Jeff Tarango
Former professional tennis player on 5 live sports extra at Flushing Meadows
Waking up 25, 20 years later you have to say this is an opportunity - when Sloane Stephens looks back she will say she had an opportunity, she's not going to think of it in an a negative way, so that's what she has to do now.
This match will be decided by whose attitude is better at the end. The tape is out, who's going to run through it first?
Image source, Getty ImagesStephens 6-3 3-6 5-4 *Sevastova
Over to you Anastasija.
The Latvian has to serve to stay in the match. She has a changeover to stew on that situation.
And as the players rise to their feet, the Flushing Meadows crowd leave her in no doubt about the gravity of this game.
*Stephens 6-3 3-6 4-4 Sevastova
Jeff Tarango
Former professional tennis player on 5 live sports extra at Flushing Meadows
Anastasija Sevastova is looking like she's almost in tears, she's pushing herself so hard in the quarter-finals of a Slam for the second year in a row - surely she's been thinking about that for 360-something days.
The biggest stat from here on out is the unforced error count. Whoever ends up with more will not take that prize money home.
Image source, Getty Images*Stephens 6-3 3-6 4-4 Sevastova
Sloane Stephens keeps a nerve-jangler of a backhand volley within the lines to move 40-30 up.
Creak, squeak. How are those nerves?
Stephens plants her forehand wide by a matter of milimetres and is dragged to deuce by her ankles.
*Stephens 6-3 3-6 4-4 Sevastova
Jeff Tarango
Former professional tennis player on 5 live sports extra at Flushing Meadows
I did not think Sloane Stephens was going to win that point, but she raced up there.
The gloves are off at four-all.
*Stephens 6-3 3-6 4-4 Sevastova
After north of two hours, we are still perfectly balanced in this box-of-frogs match.
Sloane Stephens runs down a drop shot and prods a precise backhand down the line to land a winner and convert the second of two break points.
Image source, EPAStephens 6-3 3-6 3-4 *Sevastova
Anastasija Sevastova strains a backhand into the net after bopping a forehand mis-hit wide.
She is 15-40 down, annoyed with her box and a bundle of nerves and misfiring synapses.
Two break points for Sloane Stephens.
Stephens 6-3 3-6 3-4 *Sevastova
This match has more twists than a Brazilian telenovela.
Anastasija Sevastova snatches the initiative back from Sloane Stephens and the Arthur Ashe crowd took that game like a punch to the solar plexus.
Image source, Getty Images*Stephens 6-3 3-6 3-3 Sevastova
Jeff Tarango
Former professional tennis player on 5 live sports extra at Flushing Meadows
With every point Sloane Stephens wins, this crowd gets louder. They feel like they are willing her back into this match.
It worked for Madison Keys last night.
*Stephens 6-3 3-6 3-3 Sevastova
It seemed that Sloane Stephens was on the bus home, but with a snap of the fingers and sparkle of diamond grit she is back in the room.
Anastasija Sevastova saves one break point, but, on top in a rally for the second, she drills her forehand into the top of the net.
Image source, Getty Images