Salisbury comes up with the goods.

A back-and-forth with Zeballos ends with the latter putting into the net.

40-30.

Again it comes to Skupski and this time he fires wide.

40-15.

Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

Skupski is being targeted now and he can't find a way out of his funk.

Brutal business is top-level sport.

Skupski tries to put one down the middle but it's long.

30-15.

It's Granollers on serve now.

He tries to go down the line but comes up short. 15-15.

Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

As if things couldn't get tenser, Skupski gets a time violation warning.

He uses the moment to reset and have another chat with Salisbury.

But the Scouser can't do anything about the humdinger of a return which flies past him.

The woos from the Ashe fans which greet Granollers' shot tell you how hot it was.

Needs a big effort from the British pair to turn this back around.

The more you watch that return from Granollers, the better it gets.

He was at full stretch on the baseline and somehow managed to get the right direction on it.

Wow.

What a return from Granollers. It kisses the line.

They will serve for the title.

Skupski comes up with a good second serve and saves the first break point.

That'll help to restore a bit of confidence.

The Liverpudlian smashes a forehand and it's returned long from Zeballos - second break point saved.

Still one to come...

Skupski sends long from the baseline and roles are reversed.

Granollers and Zeballos have three break points.

Edge of the seat stuff.

A double fault from Skupski - his second in this deciding set - sees the Brits trailing 0-30.

Skupski is struggling mentally here.

Skupski needs to put those loose shots as far from his thinking as possible now.

Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

Skupski blows out his cheeks and looks towards brother Ken in the box for support.

That was a tough returning game.

Salisbury goes over - almost like Gary Lineker to Gazza - to make sure he's still there mentally as he prepares to serve.

No tears like Gazza, thankfully.

For the second time in this match, Granollers and Zeballos get the hold from 0-40.

Remarkable.

On we go.

Ah.

Again it's into the net from Skupski.

Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

Blimey, this is tense.

"Oh. My. Godddd," sighs one American girl nearby as another championship point slips away from the Brits.

Quite.

Granollers and Zeballos saved three break points in the second set. Can they do it again?

Skupski puts into the net and then it's wide.

One chance remaining.

Another big volley from Salisbury.

THREE CHAMPIONSHIP POINTS FOR THE BRITS!

Salisbury steps up to the net and hits a volley to get the Brits off to a perfect start. 0-15.

Skupski follows with a beautiful cross-court winner. 0-30.

Salisbury wants to do it all on his own. Lovely serve and volley play to get to 30-0.

The hold to love swiftly follows.

Zeballos will serve to stay in the match.