Jack Draper puts that earlier wobble in the rear-view mirror to close out the second set with an ace.

A smattering of double faults in there and his first serve percentage is down at 45% but he'll be pleased to have regrouped and got that one over the line.

Better serving from Jack Draper earns him two set points.

Last time Jack Draper was serving for the set things did not go to plan.

Can he get it done this time?

Federico Gomez saves the first break point but then gets very unfortunate with a net cord and Jack Draper will have a second chance to serve for the set as he breaks for a second time in the set.

Image source, Getty Images

More like it from the world number five.

Jack Draper brings up two break points of his own as he tries to restore that advantage.

What has gone wrong here for Jack Draper? A dip in energy? Arm giving him jip?

"Come on, come on" he shouts to himself as he desperately tries to get back on track.

Well he had chances in Jack Draper's last service game to cancel out the break and this time Federico Gomez takes them.

Really uncharacteristically poor serving from Draper and he concedes the break.

Oh goodness me.

Another double fault from Jack Draper.

"Take your time" is the message from his coaching box. I'm not sure what's happened here with the Brit but his serve is miles off it right now and he hands Federico Gomez two break points.

That last service game from Jack Draper was, well, not great.

He'll need to tighten things up to see out this set.

Jack Draper fires long then is handed a lifeline with a double fault from Federico Gomez but the Argentine makes no mistake with a blistering ace to force Draper to serve it out.

Federico Gomez is serving to stay in this second set and he works himself to a convincing 30-0 lead.

There's no doubt Madison Keys has made life very difficult for herself but this is an impressive performance from Renata Zarazua, who missed five set points in the first set and then went 3-0 down in the second.

But the Mexican, who has never beaten a Top 10 player before, is well and truly back in this match now, and wins her first service game in the deciding set without dropping a point.

Image source, Getty Images

Wow. Federico Gomez crunches a forehand winner off Jack Draper's second serve and earns himself a second break point.

The Brit's first serve continues to be MIA but he finds the line with his second to wipe out break point.

More hustling hands him game point before he clinches the hold.

Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

Jack Draper tries to get himself going as his serve comes seriously under pressure for the first time in the match.

"Come on, come on, COME ON!" he shouts before collecting another ball.

You can hear Draper clearly even though there is a constant hum of noise on Louis Armstrong Stadium.

In typical New York fashion, the fans stood on the lower bowl concourse are chattering as they wait for hots dogs and Honey Deuce.

A complete contrast to the hushed silence at Wimbledon.

Asia Muhammad
Women's Doubles World No.17 on BBC Radio 5 Sports Extra 2

There's been a lot of different body language on both sides of the court in this game.

You can tell Jack Draper knows it's important to get this service hold...

Nervy moments for Jack Draper on his second serve but he manages to keep his cool to take us to deuce.

He earns game point but a loose forehand sends us back to deuce.

Wow. A serious wobble on serve for Jack Draper as he hits three double faults in one game to hand Federico Gomez a break point.

Image source, Getty Images

Madison Keys' coach and husband Bjorn Fratangelo tells her "Don't give her anything for free" but she's not heeding his advice, with another unforced error giving Renata Zarazua an early advantage in the tie-break.

The sixth seed's 13th double fault of the day gives Zarazua three set points - and the Mexican needs just one, with a well-constructed point clinching the second set and taking us into a decider.

Federico Gomez responds with a very impressive hold to love of his own.

Jack Draper two games from taking a two-set lead.

Jonathan Jurejko
BBC Sport senior tennis reporter at Flushing Meadows

Ever been back to the same bar/pub on the lunchtime after a raucous night before?

I'm sure you have. Come on, admit it. No judgement here.

Anyway... the point being, there is that feeling of returning to the scene of the drama here on Louis Armstrong Stadium.

This is where Daniil Medevdev was carrying on last night in that chaotic encounter against Benjamin Bonzi.

Security has been beefed up at the entrance to the photographers' pit to ensure no sleepy snapper wanders onto the court today...