Hello and welcome to LIVE updates of the US Open first round clash between No.4 seed Alexander Zverev and home favourite Sam Querrey. The players are due on court at Arthur Ashe Stadium from 17.00 BST.

GAME, SET AND MATCH! – ZVEREV 6-4 7-5 6-2 QUERREY. That’s it! Zverev chalks up a 12th match unbeaten as he serves out to love and seals victory with a sweeping crosscourt backhand. Last year’s finalist gets the job done in one hour and 39 minutes and will meet Ramos-Vinolas or Pouille in round two.

ZVEREV 6-4 7-5 5-2 QUERREY. That’s dogged stuff from Big Sam as he refuses to hand his opponent the win via a breadstick. He saves match point from deuce and manages to stand firm to pose the serve-out question.

ZVEREV 6-4 7-5 5-1 QUERREY. Sascha backs up the double break and is now just the one game away from a safe passage into the next round.

BREAK! – ZVEREV 6-4 7-5 4-1 QUERREY. It’s all over bar the shouting. Querrey’s arm seems to know it too as his service game has fallen below its lofty standards now. Zverev pushes to deuce and the American can’t power his way out of trouble this time. It’s a double break and the No.4 seed is on the march!

ZVEREV 6-4 7-5 3-1 QUERREY. It’s so assured from Zverev. This could have been a really tricky first round encounter given the pace on the court and Querrey’s desire to put on a show in his home Slam. It’s not been the case so far though. The German has been super steady.

BREAK! – ZVEREV 6-4 7-5 2-1 QUERREY. It’s looking bleak for Sam now. Zverev pounces early this time around and is now two sets and a break to the good. Suddenly the world No.78 will be feeling his 33 years despite a match packed with short points.

ZVEREV 6-4 7-5 1-1 QUERREY. No surprises at the start of Set 3 as both players motor through a hold apiece.

SET! – ZVEREV 6-4 7-5 QUERREY. Déjà vu indeed. Zverev serves it out to 15 and is one set away from the second round.

BREAK! – ZVEREV 6-4 6-5 QUERREY. It’s not a Game 9 wobble – but Game 11 this time. Querrey throws in another horror show on serve at the business end of the set. It’s a complete anomaly in the context of the rest of his serving stats, but it’s very costly in terms of the match. He coughs up two break points and gift wraps the break to his opponent with an untimely double fault.

ZVEREV 6-4 5-5 QUERREY. Zverev doesn’t show any signs of pressure as he marauds to a hold to 15. The tie break looms larger on the horizon…

ZVEREV 6-4 4-5 QUERREY. Zverev miss-hits a spectacular winner into the corner and apologies – though he’s not really sorry! Querrey responds with some clever serving to wriggle out of dodge and avoid a similar blow that cost him the opener. Instead, the pressure is on AZ to serve to stay in it.

ZVEREV 6-4 4-4 QUERREY. The serving procession continues. It’s a love hold. Will we have another twist a la set one? Or are we heading towards a tie break?

ZVEREV 6-4 3-4 QUERREY. Rapid. Querrey moves up to 10 aces as we enter the business end of the set.

ZVEREV 6-4 3-3 QUERREY. Zverev is finally put under some form of pressure at 15-30 but follows up a sizzling crosscourt forehand with a tricky, low volley into the open court. The door is then slammed firmly shut and we remain on serve.

ZVEREV 6-4 2-3 QUERREY. That’s a fine hold and a much-needed moment of jeopardy in this match. Querrey faces up to double breakpoint but finds a big serve and a delightful volley to stave them off. The rest of the script you know. Big serves = game Querrey.

ZVEREV 6-4 2-2 QUERREY. We remain on serve as Querrey continues to struggle to carve out openings on the German’s serve.

ZVEREV 6-4 1-2 QUERREY. Big Sam is fully aware that his serve is his biggest weapon and with the cushion of a 30-0 lead slams down a huge second serve to snare the point. He tries it again seconds later but coughs up the double fault. It matters little as he eases to the hold soon after.

ZVEREV 6-4 1-1 QUERREY. Too good. Zverev follows suit as he drops just the one point on his way to getting on the board. It's been a close match but AZ has looked in control without hitting anywhere near top gear.

ZVEREV 6-4 0-1 QUERREY. The American veteran gets back to basics on serve and charges through a hold to 15. It's one of those matches where chances are at a premium so focus and being ready to seize the opportunity are crucial to succeeding.

SET! - ZVEREV 6-4 QUERREY. The No.4 seed is just too solid as he concludes a 32-minute opener with his fifth ace of the match on his second set point. Querrey will rue that Game 9 collapse as he’d gone very much toe-to-toe with the German until that point.