Postpublished at 16:59 British Summer Time 20 August 2016
Thanks for following the game with me.
You can read the full match report here.
You can also get reaction to all of Saturday's results here.
Watford XI: Gomes; Cathcart, Prodl, Britos, Amrabat, Behrami, Capoue, Guedioura, Holebas, Deeney, Ighalo
Chelsea XI: Courtois; Ivanovic, Cahill, Terry, Azpilicueta, Kante, Pedro, Oscar, Matic, Hazard, Diego Costa
Matt Davis
Watford 1-2 Chelsea
100% start from Antonio Conte's side.
Watford had looked good for the win after Etienne Capoue's strike on 56 minutes but those substitutions changed the game.
Michy Batshuayi equalised on 80 minutes, before Diego Costa score a late winner for the second game in a row.
Watford 1-2 Chelsea
Watford are shell shocked.
Antonio Conte's substitutions have changed the game.
As I type that Michy Batshuayi rattles the bar.
Costa
Cesc Fabregas dissects the Watford defence and his perfectly timed pass finds Diego Costa who charges into the box and slips it under Heurelho Gomes.
Watford 1-1 Chelsea
Michy Batshuayi is making an absolute nuisance of himself, he gets into the box and crosses for Branislav Ivanovic, but Heurlho Gomes is brave and saves at the feet of the Serbian.
Watford struggling to hold on here.
Michy Batshuayi
The Belgium scores his first Premier League goal since a £33m arrival from Marseille in the summer.
Eden Hazard shoots from distance, Heurelho Gomes gets down and saves but can only push the ball into Batshuayi's path who scores from close range, just seven minutes after coming on.
Watford 1-0 Chelsea
Cesc Fabrega is on for Nemanja Matic.
It's his first Premier League appearances this season, can he make a point to Antonio Conte?
He has made all three substitutions now, dice have been rolled.
Watford 1-0 Chelsea
Still just the one shot on target for Chelsea in the whole match, that's despite 60 per cent possesion.
Watford 1-0 Chelsea
Branislav Ivanovic forces a corner but is cleared from Watford.
Time ticking away for Chelsea.
Watford 1-0 Chelsea
Chelsea throwing everything at this now.
Watford 1-0 Chelsea
Oscar off, new Belgium striker Michy Batshuayi on.
Watford 1-0 Chelsea
Pedro off, Victor Moses on.
Watford 1-0 Chelsea
It's getting a bit more heated at Vicarage Road as Chelsea try and get an equaliser.
Miguel Britos fouls Eden Hazard on the edge of the box and earns himself a booking.
Oscar takes the free-kick but it is straight into the wall. The ball falls for him again and he lofts it into the air but Britos clears.
Watford 0-0 Chelsea
Diego Costa goes down very easily in the Watford box. He has already been booked but referee Jon Moss waves it away. Think the Spain striker is lucky there.
Watford 1-0 Chelsea
Watford putting the pressure on now, they are going for a second.
N'Golo Kante fouls Troy Deeney and gives a free-kick to Watford.
Jose Holebas takes it but smacks it into the wall. Ball is held up in the box by Odion Ighalo and there are shouts of a handball but nothing in it.
Watford 1-0 Chelsea
Has that goal sparked Chelsea into life?
Eden Hazard has a low shot saved and then Nemanja Matic shoots wide.
Watford 1-0 Chelsea
Diego Costa was shown a yellow card for dissent in the aftermath of that goal.
Capoue
Two in two for Etienne Capoue.
Adlene Guedioura's cross finds the Frenchman in the box, who is in acres of space, the Chelsea defenders are sleeping as he controls with his chest and rifles it into the top left corner.
Watfod with a thoroughly deserved lead.
Watford 0-0 Chelsea
Oscar's early ball finds an arriving Eden Hazard in the box and he tries to go with the first-time effort on his left foot but blasts wide.
Hazard of 2014/15 would have buried that.
Watford 0-0 Chelsea
Bit more press from Chelsea this half. Wonder what Antonio Conte's team talk was like?