This is a good recovery from Safarova, pushing Vandeweghe all the way, and suddenly, she's got two break points over the American.

Vandeweghe rescues one with an almighty ace, but she goes too big on a forehand! The first break of this set goes the Czech's way.

Image source, Reuters

Safarova wins a tussle at the net with a smash, and Vandeweghe then lops a serve into the net.

Safarova holds. Just.

A furious forehand from Safarova stretches Vandeweghe, and she can't get her racquet onto the shot.

Safarova's lead is shortlived, though, as she double faults again.

Now Vandeweghe controls the rally, running behind the baseline and forcing Safarova's big swipe into the net.

Safarova's response? A 105mph serve that Vandeweghe spoons wide. Deuce.

That's good work from Safarova, sending Vandeweghe one way and hammering a forehand winner the other.

Another lovely cross-court winner comes Vandeweghe's way for 40-0, but the American gets on the board as Safarova swings and misses down the line.

Now the errors creep in from Safarova, and suddenly her lead goes missing. She double faults, and that's deuce.

Image source, AFP

Safarova stays on her opponent's tail with some lovely return shots, but at 40-30 the Czech messes up a cross-court forehand which lands wide.

Vandeweghe holds.

Safarova lands her third ace of the match to move to 30-0.

She deals well with a Vandeweghe onslaught from the baseline, and the American overcooks the baseline for 40-0.

Same again on the next point, giving Safarova a hold to love.

Image source, AFP

Coco Vandeweghe is back on serve but it's Lucie Safarova who snaffles the first point with a gorgeous cross-court winner.

The New Yorker recovers to 40-30 and Safarova nets for the second consecutive point, handing a hold to Vandeweghe.

Over on Louis Armstrong Stadium, it's still going with serve in the other women's last 16 match between Daria Kasatkina and Kaia Kanepi.

It's 3-3 in the first set.

Image source, get

Safarova saves the first with a serve right into the corner of the court, and Vandeweghe nets.

She can't save the second though! A forehand winner from Vandeweghe, and she takes the first set.

Image source, AFP

Safarova had three chances to break in that last game and shelled all of them.

Vandeweghe makes her wince as she thuds an almighty, two-handed backhand to an angled serve to go 0-30 up.

And then Safarova blazes an easy forehand into the net! That's three set points for the American.

Advantage Vandeweghe comes and goes as Safarova steps in and finds the winner.

An almighty forehand then puts Vandeweghe back in control, and Safarova can't make hay as Vandeweghe holds. That could be a costly miss for the Czech.

A fine rally goes Safarova's way as a big Vandeweghe backhand goes long, before a loose forehand from the Czech finds the net.

Ooh, a backhand error swings things Safarova's way, before another wayward strokes hands Safarova a break point.

No worries, though. A big serve from Vandeweghe and Safarova, going for the big forehand winner, hoicks it long. Deuce.

Hands on hips from Vandeweghe as there's a very late call of out on her forehand - a forehand that landed perfectly on the line and that Safarova summarily smacked wide.

Vandeweghe has her usual disagreement with the umpire over replaying the point, but errs a few times as Safarova holds to 15. Vandeweghe throws her racquet in frustration.

Image source, AFP

Piers Newbery
BBC Sport at Flushing Meadows

Rafael Nadal has headed pretty swiftly to the interview room after his win over Alexandr Dolgopolov, and is pondering the suggestion that 19-year-old Andrey Rublev has nothing to lose in the next round.

"He's young but he's in the quarter-finals and has the chance to be in the semi-finals for the first time in his career, so of course he has things to lose. This sport is about victory, it's not about defeats. At the end of your career nobody remembers the losses, they remember the victories."

That's nice from Vandeweghe, a backhand volley at the net getting her the first points of the game.

Safarova times the pants off an airy forehand to get on the board before consecutive big serves from Vandeweghe end things rather abruptly.

Image source, AFP

The umpire gives somebody in the corporate boxes a telling off for making too much noise, before Safarova crashes through her service game.

She sends down an ace to tidy up a love hold.

"Come on!" yells Vandeweghe as Safarova's response to her serve goes awry, and she holds with a corker of a second serve.

Image source, Reuters

Vandeweghe drops short and Safarova is so quick on her feet to get to the net and volley a winner for 30-30.

There's a noise of annoyance from Vandeweghe as she tonks a forehand long, handing Safarova a break point, but a strong forehand return from the American sees the Czech slap a pick up into the net.

Deuce, once again.

Pat Cash, decked out in blue, gets to his feet and applauds as Vandeweghe makes her way back out.

Safarova slices a serve out wide and Vandeweghe's return is long, but she returns a belter of a backhand down the line to draw leve.

The Czech tidies up with another slicey serve that Vandeweghe can't return, and Vandeweghe then sends a forehand out.

Image source, Reuters

Vandeweghe challenges as a serve is called out, and she's right to do so. It's an ace down the T, and the American has the advantage.

And she follows it up as Safarova lashes a forehand long.