It would have been unthinkable, even crazy, to predict at the start of the season that after eight Premier League games, Watford would sit in fourth place ahead of Chelsea, Arsenal and Liverpool.
Going into Saturday's game, both the Hornets and Arsenal had the chance to make that jump and despite the positive effect Marco Silva has had on their improvement, the Gunners would have been the favourites.
After a battling, hard-fought first-half the teams were separated when Per Mertesacker rose above the Watford defence to head home a 39th minute corner.
In the second half, Watford came out inspired and played with more drive and determination. Troy Deeney dispatched a controversial penalty with 19 minutes to go after Hector Bellerín was adjudged to have brought down Richarlison inside the box.
That goal, coming off the back of Mesut Özil's great chance to make it 2-0, changed the tempo and direction of the game and Watford pushed forward.
Asking questions of the Gunners defence and in injury-time after a flurry of shots the ball dropped perfectly to Tom Cleverley to score the winner.
Watford move to 15 points after eight games and pick up their first home win of the season.
Here are five things we picked up from Watford's 2-1 win over Arsenal on Saturday.
Watford change to 3-4-3
When Marco Silva announced his XI for the game, it was clear the Portuguese boss was going 3-4-3 to battle Wenger with a like-for-like formation.
The Gunners shape regularly goes from 3-4-3 to 3-4-2-1 and the forwards have freedom to roam find space and link up.
Watford without the ball were playing a clear 5-4-1 with Richarlison and Roberto Pereyra pulling back wide to protect the defence. It frustrated the Gunners attack and the home side did a great job of closing down space and pouncing on loose passes.
It worked in most part and despite the Gunners possession advantage, they create few clear cut chances in the first half.
The problem for the Hornets is it left them a little isolated upfront. Much to Silva’s dismay sometimes, they would go long and try to hit Andre Gray, but there’s no chance the former Burnley forward was winning an aerial battle with Mertesacker and Laurent Koscielny.
Watford’s best play came when they stayed patient, let Abdoulaye Doucoure run the midfield and let the forwards and wing-backs get high up the pitch.
It may not have worked on Saturday, Silva later changing to 4-3-3 and going with Deeney's power and physicality with the pacey wide men either side, but there were enough positive signs from their new-look formation that it's worth looking at again.
Gray can learn from watching Lacazette
At half time on Saturday, Gray had touched the ball just 17 times. Even Heurelho Gomes in the Watford net had seen more of the ball.
It’s safe to say the 26-year-old was isolated when his two forward partners were pulled wide to defend.
However, on the other side of the pitch was Alexandre Lacazette. Playing a similar role, central of a front three, for most of the first half he cut a similar figure, but then he does what the Frenchman does best. Got himself involved.
At the break he only had five more touches, but he made more of his 22 then Gray managed.
Coming deep to link up, he brings Danny Welbeck and Alex Iwobi into play, there are neat triangles with Granit Xhaka and Mohamed Elneny, and it allows the former Lyon man to get involved and create space for runs in behind.
Even at 26, there is still space for Gray to get better and he could learn a lot from watching the movement and involvement from Lacazette on Saturday.
Removed after 62 minutes, Gray ended with 21 touches, but with Deeney’s introduction, he showed what you can do with just 15.
Dazzling Abdoulaye Doucouré
Rennes fans couldn’t understand when after signing Abdoulaye Doucouré in 2016, the box-to-box midfielder was loaned out to La Liga side Granada.
Now, Watford are getting to see why he was so loved in France. The 24-year-old has three goals this season and most of the Hornets best play on Saturday came when the Frenchman was bursting through the midfield.
He finished the game with three key passes, two tackles, one clearance, one interception and 67 touches and you can guarantee that if he was playing for one of the traditional top six and putting up the same numbers more and more people would be raving about his performances.
Marco Silva Subs Makes the Difference
Once a coach picks his XI and gives his final orders, his next most important decision is when to make changes. We recently discussed Wenger’s decision to give Olivier Giroud few minutes off the bench – he got 23 on Saturday – and it was the inclusion of Deeney off the bench on the 62nd minute that turned the game at Vicarage Road.
After Gray set the tone running across the front line, it was up to the big centre-forward to punch home his physical advantage and give the Arsenal back-line another test.
The 29-year-old has played just 150 minutes this season, but he scored with his one shot on goal, the penalty, made two key passes, but most importantly won six aerial battles against the Gunners back-line.
His introduction and the timing off it was perfect and gave Wenger’s defence something new to worry about and he made a huge difference, even playing his role in the winner.
You have to take your chances
Football is decided by little moments, the free-flowing nature of the game is what separates it from any of it’s American cousins and it’s what makes it such a brutal and beautiful game.
Arsenal had struggled to create any meaningful chances in the first half, but Mertesacker’s header from a corner gave the away side the lead and their first away goal of the season.
Set-pieces are the great leveller, no matter your ability or level, a well played cross and dominant header can create a goal from nothing.
On the other side of the spectrum, when you create chances, you have to take them. Coming off the bench, Özil had a superb chance to give the Gunners a 2-0 lead with 19 minutes to go, but the German fluffed his one-on-one chance and Gomes was able to make the save.
Watford then go up the pitch straight away and Bellerín sticks his leg out, Richarlison goes down, a debatable decision, but Neil Swarbrick pointed to the spot.
Deeney, also off the bench, tucked it away and brought the game level.
That changed the tempo of the game and Watford went on to score the late winner. The result changed in an instant, delight for the Hornets, despair for the travelling fans.