Mustafi knocked knees with himself in that last incident and is off the pitch to be treated. Gomes flaps at a corner, but is more assured seconds later to swallow a low shot from Lucas Perez on the turn.
90' +4
It's getting a bit embarrassing for Arsenal. Mustafi is too slow to latch onto Sanchez's through pass and tries in vain to win a penalty. That's the third or fourth attempt at that in this game.
90' +2
T. Cleverley gets yellow.
Walcott is put through down the right side and tries to cross for Lucas Perez, but he doesn't get his head up and slams it right into a defender. He's snatching without thinking at these chances.
Cleverley upends Monreal on the edge of the area and is booked. Arsenal can't do anything with the free-kick though.
90'
Oxlade-Chamberlain hasn't been shy to shoot from ill-advised positions, so I don't know why he suddenly went for an over-hit pass to Ozil from a roomy spot at the top of the box.
Into stoppage time, of which they'll be five minutes. Sanchez, who has scored in his last three games against Watford, got the winner 97 minutes in against Burnley last time out in the league.
88'
S. Okaka gets yellow.
Okaka is the latest player in the book for fouling Iwobi.
It's now or never for Arsenal, but it will have to wait for another attacking wave as Walcott's poor first touch sees him lose the ball and fall to the turf trying to win a penalty.
86'
A. Sánchez gets yellow.
Sanchez is shown a yellow card for dissent.
OFF THE CROSSBAR! A throw-in catches Watford with their pants down, and Lucas hammers a thunderous effort that nearly dents the frame of the goal. Moments later, Koscielny makes an important tackle to deny Okaka.
85'
S. Okaka enters the game and replaces T. Deeney.
Slim pickings in the second half for Deeney after scoring the goal that separates the sides. On comes Okaka.
82'
The corner is cleared to the edge of the area where Monreal makes a tremendous connection with a volley, but it's a foot or two off target.
81'
Sanchez takes the free-kick but he can't beat the wall. Corner.
80'
Sanchez gets the ball in a more central position and tries to shoot from 25 yards, but Cleverley is in position to block. Moments later, Arsenal win a tasty free-kick well within shooting range.
Minute
Description
78'
You get the feeling that the Arsenal resurgence is ebbing away a little. However, the Gunners have been known to knock in a late goal or two this season. This one is far from over.
76'
Lucas has acres of space on the right-hand side and plays the right ball for the wrong man. Gabriel attacks it at the top of the box, leans back, and skies it.
74'
Cleverley is down on the deck and in need of treatment, but it appears that he will be alright to continue. Just over 15 minutes to go for Watford to hang on.
70'
I. Success enters the game and replaces M. Niang.
Niang heads off with Isaac Success coming on. Excelsior.
Watford continue to work overtime at the back as they struggle to keep the ball out of their own half for more than a pass or two. Oxlade-Chamberlain twice has shooting chances at the top of the box that are blocked.
67'
Lucas Pérez enters the game and replaces F. Coquelin.
It's all out from here for Arsenal as Coquelin jogs off for Lucas Perez in their final change. That makes Oxlade-Chamberlain probably the most defensive player outside of the back four.
66'
S. Prödl gets yellow.
Prodl, who has been excellent so far, came through the back of Sanchez. He actually won the ball, but the continuing slide on the wet surface made the challenge look worse than it was. Yellow card.
64'
Iwobi is seeing a lot of the ball out on the left, and he's causing Watford problem after problem. Arsenal are sensing a comeback here, although they won't do it with passes like that one from Oxlade-Chamberlain that heads out for a goal-kick.
63'
A. Doucouré enters the game and replaces V. Behrami.
Doucoure has been introduced in place of Behrami.
62'
Coquelin squeezes the ball into Walcott, who gets too excited and tries to shoot on the turn when he had a free man just behind him. It's blocked and Ozil tries to counter with a cross that Gomes deals with.
60'
Just before that goal, Mazzarri was screaming and gesticulating at his team to play a 5-4-1. Right now, the lineup of yellow shirts looks akin to a 6-3-1. Whatever it is, they're still being played off the park by Arsenal.
58'
A. Iwobi has scored a goal for Arsenal! Assist by A. Sánchez.
Sanchez has been tireless as usual and worked that move well.
ARSENAL GET THEIR GOAL! You didn't need to be the Weeknd to feel that one coming. Sanchez advances across the byline on the right and loops in a cross for Iwobi to squirm over the line.
57'
ANOTHER SAVE! Watford looked to have had a cross under control, but Britos and Behrami get in each other's way. Ozil nearly exploits that hesitation with a half-volley, but the keeper is all over it again.
55'
SAVED! Iwobi causes trouble on the left again, getting the better of Cathcart and exchanging a one-two with Oxlade-Chamberlain. He strikes on the turn, but Gomes gets a hand out to thwart him!
52'
Arsenal have showed more in the opening minutes of the second period than they did for all of the first. Sanchez drives at Watford again, but a nick away from Cathcart takes it beyond Iwobi.
50'
THAT SHOULD HAVE BEEN A GOAL! Iwobi does well to wrestle away from Cathcart and square for Ozil, who then plays in Walcott in all sorts of space. He takes too long to line up his finish though, and Gomes blocked.
48'
Arsenal are coming at Watford in the second half, as Walcott gets his first touch inside the area, but he fires a low cross behind the goal with teammates lining up for the finish.
46'
T. Walcott enters the game and replaces O. Giroud.
Giroud has been replaced by Walcott as Arsenal go for a more mobile frontline.
Here we go again.
45' +1
Arsenal simply cannot advance the ball fast enough into the final third to catch Watford unawares. Niang tracks back and defends well against Gabriel, who tried to touch the ball past him.
44'
There's some promise as Sanchez plays the ball forward for Giroud, who touches it back to the Chilean. It's spread wide to the opposite side for Ozil, but his curler to the back post is horribly wrong.
42'
Ozil spreads the ball wide to Iwobi, who gets an early centre into Sanchez. The Chilean can't control as the ball is cleared to Oxlade-Chamberlain at the top of the box, but his dink to Monreal is a dud.
40'
Every single 50-50 seems to be won by Watford. The Hornets are bullying Arsenal at very turn, with Capoue's mobility and physicality in midfield flummoxing the opposition.
38'
What is going on with Arsenal? Janmaat hammers the ball towards goal after good worn from Deeney, but Cech pounces across to parry the ball! That came from another sloppy turnover, this time from Monreal.
36'
From the resulting corner, the ball finds its way to Miguel Britos at the back post, and the full-back whacks it towards goal, but Giroud is there to block in front of Cech, who also looked to have had it covered.
34'
Capoue accelerates down the left after a free-kick is taken short and he hoists a cross into the area for Prodl to meet with a looping header. Cech tips it over to be sure.
32'
Arsenal visit Chelsea on Saturday, and it's a game that they really need to win to lasso in the runaway league leaders. They'll also want to go there with some momentum - which is the exact opposite of what they've been playing on in this game.
30'
Alexis Sanchez tries to get something going by skipping past one player on the left, before he's tripped by Behrami. The midfielder knows that he messed up, but also gets away with just a lecture.
27'
Cech twice has to scurry to the edge of his area to nip in and win the ball against advancing Watford attackers. The home fans try to roar their side into the final third, but it doesn't last long.
25'
Nacho Monreal gets yellow.
No sign of Watford relinquishing control of this match. Arsenal are starting to exert themselves more in possession, but the visitors are defending well, with Gomes also looking assured between the posts.
Nacho Monreal stops, drops and rolls in the box. The ref follows through with a yellow for simulation.
22'
Central midfield is the one position that Arsenal could have done without a setback. Ramsey joins Santi Cazorla on the treatment table and with Xhaka suspended and Mohamed Elneny away - and injured - on AFCON duty, Coquelin is now the only available option.
21'
Gabriel Paulista gets yellow.
Stefano Okaka gets bundled over by Gabriel, who's booked.
20'
A. Oxlade-Chamberlain enters the game and replaces A. Ramsey.
Ramsey's absolutely miserable evening is at an end as he looks to have picked up a hamstring injury. He heads straight down the tunnel, and Alex Oxlade-Chamberlain is summoned to replace him.
19'
Wenger looks absolutely helpless seated up in the stands. It would be sort of foolish to draw a connection this early in the game between his absence and Arsenal's malaise, but he can't be happy up there.
17'
And how about the terrible start to the game by Ramsey. It's tough to really blame him for deflecting a free-kick into his own net, but he seemed so, so unconcerned after he lost the ball to Capoue in the buildup to the second.
15'
Two ex-Tottenham players in Kaboul and Capoue have done the damage for Watford in the opening 15 minutes, and the visitors are nearly in again as Daryl Janmaat advances down the right in space, but his cut-back can't find Deeney.
13'
T. Deeney has scored a goal for Watford!
IT'S ANOTHER ONE FOR WATFORD! Arsenal are falling apart. Etienne Capoue swarms all over a lazy Ramsey, swiping the ball, driving past two players and firing a low shot that Cech saves, only for Deeney to convert the rebound.
10'
Y. Kaboul has scored a goal for Watford! Assist by T. Cleverley.
Goal Tom Cleverley
KABOUL SCORES! That came out of nothing, and it's a huge slice of luck for the visitors. A free-kick was touched onto the ex-Tottenham defender, who put his laces through the ball, and a crucial deflection off Ramsey saw Cech fooled.
Niang played the set-piece short to Kaboul.
9'
One rather unusual statistic that Arsenal will hope to end today is the fact that the last four goals they've conceded at home have all been penalties.
8'
Gabriel goes up for the delivery from Mesut Ozil, and the ball bounces to Ramsey at the top of the box. He tries an ambitious volley, but puts it well wide of the mark.
7'
Not good enough from Tom Cleverley, who curls the set-piece into the stands behind the goal. Arsenal are on the attack moments later, and a floated ball in towards Olivier Giroud force Watford to concede a corner.
5'
Iwobi runs into trouble on the ball as he gets his pocket picked by Valon Behrami. Troy Deeney is on it about 35 yards out and is tripped, giving Watford a solid chance at a free-kick.
3'
Petr Cech is twice called into action to take care of deliveries into the area as the visitors make a decent start to the contest. Arsenal haven't gotten on the ball in a sustained manner yet.
1'
And we're off!
M'Baye Niang, on loan from Milan, makes his Watford debut tonight. Heurelho Gomes returns in goal, while Troy Deeney also heads back into the starting XI to lead the line in a defensive 4-5-1 lineup.
Granit Xhaka is suspended for Arsenal, giving Francis Coquelin a start in midfield next to Aaron Ramsey. Gabriel starts over Hector Bellerin in defence, while Alex Iwobi beats out Theo Walcott to a role on the right flank.
Watford's last win in the Premier League came nearly two months ago against Everton on December 10. They're still eight points clear of the relegation zone, but were bounced from the FA Cup fourth round by Milwall.
Arsenal have won four straight in all competitions, but are still eight points behind runaway leaders Chelsea. On the plus side, the Gunners have booked what looks like a tap-in of a fifth-round FA Cup tie against semi-pro Sutton United.
Hello and welcome to our live coverage of the Premier League clash between Arsenal and Watford at the Emirates. The hosts have won seven straight against the visitors but will be taking a stab at number eight without Arsene Wenger, who is serving a four-match touchline ban.
And that will wrap up the first half from the Emirates and the only question from a Watford perspective is why they're not three or four up. It's been domination against a pathetic Arsenal side who haven't created a single noteworthy chance. There's a long second half coming for one of these teams.
The final whistle goes to a smattering of boos but mostly echoes of silent disbelief. Arsenal can't overcome an abject first half where they conceded twice, as Watford clinch their first ever win at the Emirates. Massive win and all credit to the Hornets, but the Gunners were shockingly bad. That's all from us, thanks for joining.
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