SUBSTITUTIONpublished at 51 mins
Watford 0-3 Arsenal
Another substitute and another debut for Watford.
Daryl Janmaat, who arrived from Newcastle, comes on in place of Christian Kabasele.
Summary
Watford: Gomes, Kabasele, Kaboul, Prodl, Amrabat, Behrami, Capoue, Guedioura, Holebas, Ighalo, Deeney.
Arsenal: Cech, Bellerin, Holding, Koscielny, Monreal, Cazorla, Xhaka, Walcott, Ozil, Oxlade-Chamberlain, Sanchez.
SUBSTITUTIONpublished at 51 mins
Postpublished at 16:07 British Summer Time 27 August 2016
Watford 0-3 Arsenal
Garth Crooks
Former Spurs striker and BBC football expertI was really disappointed to see Quique Sánchez Flores leave. He did well, Watford were flying.
When a manager has departed and he did well it is difficult.
I think it will be a difficult season for Watford.
Postpublished at 49 mins
Watford 0-3 Arsenal
Some lovely, lovely football by Arsenal in the early stages of the second half.
After some one-touch exchanges, Theo Walcott has a go at goal but can only put his effort wide.
KICK-OFFpublished at 46 mins
Watford 0-3 Arsenal
We're back underway at Vicarage Road.
Walter Mazzarri makes the first change of the afternoon, and hands a debut to former Juventus forward Roberto Pereyra, who comes on in place of Adlene Guedioura.
Watford have a big old mountain to climb.
Postpublished at 15:59 British Summer Time 27 August 2016
Watford 0-3 Arsenal
Postpublished at 15:54 British Summer Time 27 August 2016
Watford 0-3 Arsenal
get involved Get Involvedpublished at 15:52 British Summer Time 27 August 2016
#bbcfootball
Alistair Wiseman: #Xhaka is looking a serious signing. Some of the balls he's pinging around are excellent. Give Giroud 45 now and he'll score.
BtheG: The understanding between Ozil and Alexis is amazing.
Paul lummis: I'm far from an Arsenal fan, but this first half has been an attacking masterclass...
Image source, PAPostpublished at 15:49 British Summer Time 27 August 2016
Half-time: Watford 0-3 Arsenal
David Pleat
Former Tottenham boss on 5 live SportWhen Alexis Sanchez gets into that area he's too clever for them. Mesut Ozil had a free header. I feel for Watford. They've been victims of an incorrect decision when Arsenal raced down the field to get a second goal.
The confidence drained out of them and now that will be even weaker.
Image source, Reuters
GOAL - Watford 0-3 Arsenalpublished at 45 mins
Mesut Ozil
It's all going on here.
Heurelho Gomes makes a superb one-handed save to deny Theo Walcott but moments later, Arsenal do make it 3-0.
Mesut Ozil sends home a bullet header after some superb work down the left from Alexis Sanchez.
The whistle goes for half-time. It's going to be a long second half for the hosts.
Image source, ReutersPostpublished at 15:43 British Summer Time 27 August 2016
Watford 0-2 Arsenal
David Pleat
Former Tottenham boss on 5 live Sport"It's a shame for Watford. They were just playing their best football of the game."
GOAL - Watford 0-2 Arsenalpublished at 39 mins
Alexis Sanchez
It was messy but they all count.
Theo Walcott sends an in-swinging ball across the box and it falls to Sanchez, who gets the ball caught under his heels and flicks it into the goal while falling over.
It doesn't hit the back of the net, but it's definitely been forced over the line. After initial hesitations, Sanchez celebrates his first goal of the season.
Image source, ReutersPostpublished at 15:40 British Summer Time 27 August 2016
Watford 0-1 Arsenal
David Pleat
Former Tottenham boss on 5 live Sport"I'm not sure what Kevin Friend was doing there. It was a very strange decision. Nordin Amrabat was free going along the by-line and had a great opportunity to get to the six-yard box and play the ball in for an on-rushing forward."
Postpublished at 36 mins
Watford 0-1 Arsenal
Now it's time for Arsenal to push forward again.
Alexis Sanchez weaves into the area and, after a one-two with Mesut Ozil, he tries to side-foot past Heurelho Gomes, but the keeper makes himself big to stop the effort.
Then Watford go on the break, and Nordin Amrabat finds himself at the byeline, but he's penalised for coming together with Laurent Koscielny.
Image source, ReutersPostpublished at 34 mins
Watford 0-1 Arsenal
Troy Deeney sends the ball across the penalty area from the left-hand side but it's blocked by the left cheek of Laurent Koscielny, who may find himself with a black eye after that.
Watford earn their first corner. Etienne Capoue whips it in, and Christian Kabasele rises high but can only head wide.
Postpublished at 30 mins
Watford 0-1 Arsenal
Nordin Amrabat continues to pester the Arsenal defence.
The Watford man gets the ball in the box and Odion Ighalo tries to control and shoot, but there's a mass of bodies in the way and it's eventually scrambled clear in a messy fashion.
Image source, Getty ImagesPostpublished at 28 mins
Watford 0-1 Arsenal
Arsenal keeper Petr Cech finds himself scrambling back towards his goal as a lofted ball over the top from Amrabat dips on to the top of the net.
Break for Watfordpublished at 24 mins
Watford 0-1 Arsenal
Watford spring into life!
Nordin Amrabat whips the ball in from the right and Laurent Koscielny almost puts it into his own net, but luckily for Arsenal Petr Cech reacts quickly to palm it away.
Image source, Getty ImagesChance for Arsenalpublished at 23 mins
Watford 0-1 Arsenal
First corner of the match for Arsenal.
Santi Cazorla lines it up on the right and the ball ping-pongs about before being cleared.
Arsenal build up again. Alexis Sanchez slides to Cazorla and Theo Walcott tries to force it home, but the block is made by keeper Heurelho Gomes.
Postpublished at 21 mins
Watford 0-1 Arsenal
Nacho Monreal and Theo Walcott are getting plenty of action down the left flank for Arsenal but it's not come to much so far.
In other news, there's really a lot of yellow tones on the pitch. Arsenal obviously fancied a change of strip today but their luminous socks and shoulder stripes are a bit of an eye sore against Watford's home kit.
See what you think on Match of the Day later. It's making me squint.
YELLOW CARDpublished at 16 mins
Watford 0-1 Arsenal
An early booking for Austrian defender Sebastian Prodl, after he clatters Theo Walcott.
Arsenal earn a free-kick about 35-yards out on the left, but it's headed away by the Watford defence.
Image source, Getty Images