Valon Behrami on for Watford. Almen Abdi off.

Diego Costa is at it again, he gets a toe to Oscar's low cross. It deflects off Heurelho Gomes, but Chelsea aren't given the penalty.

Jason Roberts
Former West Brom striker on Final Score

"It's hard to see whether Diego Costa was offside or not, but his first touch, under pressure, was excellent and his finish shows he is full of confidence now."

Image source, Reuters

Where has the Diego Costa been hiding this season?

Willian, on the right touchline, slides a beautiful, angled pass into the Watford area and Costa, probably just onside, nips in and takes a touch before hitting it across Heurelho Gomes.

Oscar pulls back for Pedro, but there's a yellow shirt diving in the way to block.

So. It was Liverpool last week. Will Chelsea be the next side to be humbled by Watford?

Stamford Bridge is stunned. Complete hush.

There's a ripple of noise as Miguel Britos tussles with Oscar in the Watford area - no penalty.

Jason Roberts
Former West Brom striker on Final Score

"Gary Cahill invites Odion Ighalo to have a shot! He's effectively saying: 'You're not going to beat me, get your shot away if you like.' And it gets the deflection and goes in.

"This is not going to be easy now for Chelsea - Watford have conceded just 16 goals this season."

We've been experiencing some issues this afternoon with our scores updating. So, just to be clear, here is how things stand in the Premier League:

Latest scores:

Aston Villa 0-1 West Ham

Bournemouth 0-0 Crystal Palace

Chelsea 1-2 Watford

Liverpool 0-0 Leicester

Man City 4-1 Sunderland

Swansea 1-0 West Brom

Tottenham 2-0 Norwich

Result from earlier:

Stoke 2-0 Man Utd

I told you he'd score. That's 29 goals in 2015 for Odion Ighalo.

Really odd from Chelsea's point of view. Ighalo is given the ball on the edge of the area, he saunters into the box as Gary Cahill stands off him. Ighalo hits it with his left foot, it deflects off Cahill and loops over Thibaut Courtois.

This graphic shows you the average position of each player.

Look at Chelsea right-back Branislav Ivanovic (number two). He's almost been a fourth striker.

Image source, .

Oscar almost bundles his way into the area, but is foiled. Nemanja Matic, perhaps with his handball in the back of his mind, has popped up on the left wing a couple of times. 

Image source, Reuters

Chelsea fans appealing for a penalty. The ball bounces up into the shoulder area of Miguel Britos. His hands are down by his side - it would have been harsh.

Diego Costa wins a free-kick as Craig Cathcart pulls him down. Booking for the Watford man.

Jason Roberts
Former West Brom striker on Final Score

"What Nemanja Matic did when conceding the penalty made no sense at all - his hands were in a position they just didn't need to be.

"And Troy Deeney's goal will give Chelsea a huge problem now, because scoring has been a difficulty."

Obviously that could be an injury to Cesc Fabregas. But he was not sensational in the first half.

Image source, Getty Images

Jon Obi Mikel on. Cesc Fabregas off.

A penny for your thoughts Chelsea fans?