- Listen to BBC Radio London commentary using the audio button
- Schlupp replaces injured Van Aanholt for Palace
- Watford bring in Cathcart and Janmaat for Holebas and Okaka
That was the chance!
M'Baye Niang lifts the ball over after Hennessey spilled the ball.
There doesn't look to be an equaliser coming.
Palace are holding on.
Excellent defending from Palace to snuff out Isaac Success.
There will be four minutes added.
Now Yohan Cabaye shoots wide!
Crystal Palace really are on top now with the pressure released at Selhurst Park after Troy Deeney's own goal.
The French midfielder has the chance to put the game to bed but his volley goes narrowly wide of the left-hand post.
That's Cabaye's last involvement as he is replaced by Bakary Sako.
What a chance to seal it!
Zaha again runs at the Watford defence, plays the ball through to Christian Benteke but the big Belgian's touch, when through on goal, is awful and gives Younes Kaboul chance to clear.
Scott Dann is on for James Tomkins for Palace who looks to have picked up an injury.
Tom Cleverley has been living dangerously on a yellow card in the second half and he has been replaced. On comes forward Isaac Success.
Christian Benteke comes to life for the first time in the match, driving to the edge of the area from deep, but shoots wide.
Abdoulaye Doucoure's 35-yard strike is swerving horribly in front of Wayne Hennessey but the Welshman does well to parry wide.
He did well after initially being surprised by the shot.
It is all getting a little heated after that goal.
Tom Cleverley, who is on a yellow card, gets a talking to from Martin Atkinson.
Watford are trying to push forward but there is no support for Troy Deeney.
And from that free-kick Yohan Cabaye's delivery is headed into his own net by Troy Deeney !
He was stretching trying to clear the ball but could only glance the ball in off the post beyond Heurelho Gomes.
More tackles flying in.
M'Baye Niang is down after a lunging tackle from Crystal Palace's Luka Miliojevic but the referee sees no issue with it.
At the other end, Prodl goes into the book for a foul on Zaha.
Now Zaha wastes Palace's best chance of the afternoon.
Andros Townsend drives down the right, crosses and the ball goes all the way to the back post to Zaha.
He is sharp enough to make a yard on Craig Cathcart but fires over.
Here's a decision for referee Martin Atkinson to make.
Crystal Palace winger Wilfried Zaha is frustrated after giving the ball away and throws a fist into Sebastian Prodl's back and pushes him to the ground.
Sensibly, Atkinson tells both to calm down and that's the end of the matter.
Amrabat is on in place of Daryl Janmaat.
It looks as though Watford boss Walter Mazzarri will turn to Nordin Amrabat to bring some life into his side's play.
The Moroccan is getting some instructions on the sideline. He was one of Watford's better players in the first half of the season but has been out since New Year's Day with injury.
More scrappy football from both teams but the home fans get a lift when the ball falls to the feet of Wilfried Zaha.
He wins a corner but it comes to nothing.
Sam Allardyce is, as ever, ferociously chewing gum on the sidelines.
Crystal Palace press early on in this second half but it is Watford who have the first shot.
Etienne Capoue shoots from outside the box, looking for his fourth goal of the season, but once again the effort is too high.
I've said that a lot in this match.
The players are heading back out.
Valon Berahmi, who was struggling with a hamstring injury before the break, is replaced by Abdoulaye Doucoure for Watford.
We are under way again.
With 53%, Watford just shaded possession in that half and had the only shot on target.
Palace have looked to get the ball wide and get crosses into the box but striker Christian Benteke has had the fewest touches of any player on the pitch, just 12.
And, as the graphic below shows, just one of those was inside the penalty area.
There will be one minute of stoppage time.
What has happened here?
Yohan Cabaye is down after a collision off the ball with Tom Cleverley who has just been booked don't forget.
Replays show there was a little tussle between the two but not much in it.
Valon Behrami takes on a speculative volley which sails over the crossbar. The Swiss midfielder hasn't scored since November 2010 - I can see why.
This is more like it from the home side.
Watford full-back Miguel Britos is forced to head a dangerous Andros Townsend cross away from under his crossbar with Mamadou Sahko lurking.
Minutes later the ball falls to Wilfried Zaha on the edge of the box but he shoots way over.
Finally Crystal Palace attack.
Zaha shows some neat footwork and cuts the ball back from the byline, it falls to Yohan Cabaye whose shot is blocked.
Watford fail to clear the following corner and Tom Cleverley slides in and fouls Zaha.
The former Manchester United midfielder gets a yellow for the tackle.
Crystal Palace have the worst home record in the Premier League while Watford have won just two of their last 12 matches and it's showing. Cabaye has the chance with another set piece for Sam Allardyce's team but his cross is headed away by Watford skipper Troy Deeney.
Groans at Selhurst Park.
Crystal Palace have the chance to break but Andros Townsend asks too much of Jason Puncheon. They get another chance but this time Joel Ward passes the ball out of play.
"M'Baye Niang has been the brightest player on the pitch," says Match of the Day commentator Jonathan Pearce.
He's had the only shot on target in the opening 25 minutes.
Watford are starting to grow into this game.
Crystal Palace have a chance to whip the ball in after winning a free-kick on the left.
What on earth was that Andros?
Mr Townsend's left-footed delivery is horribly over-hit and goes straight out for a goal kick.
It has gone very quiet at Selhurst Park, perhaps a sign of nerves in the home fans?
Don't forget Palace start this game a point outside of the relegation places but can go 15th with a win if results go their way.
There's not much happening on the pitch as Watford's Daryl Janmaat is down with a blow to the head. It looks as though he'll continue however.
Tidy play from Watford in midfield releases January loan signing M'Baye Niang.
He has the first meaningful effort on goal in the match. It is on target but straight at Wayne Hennessey.
Yohan Cabaye swings the ball in and it's met by Mamadou Sakho but he heads over.
Moments later the French defender gives away a corner at the other end but Crystal Palace goalkeeper Wayne Hennessey claims comfortably.
Chants of "same old Zaha, always cheating" from the Watford fans.
The winger was involved in a diving controversy at Vicarage Road earlier this season, you may remember.
On the pitch, Palace have won a corner...
Brilliant direct run from Wilfried Zaha on the left wing.
He's eased off the ball in the penalty area by Craig Cathcart and there are appeals for a penalty from the home fans.
Not for me.
Both teams test out the opposite defence early on.
Andros Townsend, a goalscorer in Palace's last game, darts down the right but can't force a corner and the ball is cleared.
The players are out on the pitch along with referee Martin Atkinson.
He's using one of those fancy new £1 coins to decide who'll kick-off.
Let's hope the match is more exciting than this pre-match chat.
The first round of the FA People's Cup featured more than 40,000 players and 6,000+ teams playing five-a-side, and we saw drama, excitement, cracking goals (including these efforts analysed by Dan Walker and Dean Saunders ) and some amazing stories from right across the country.
You can still catch our highlights programme on iPlayer and look out for our live text coverage of the semi-finals next weekend from 10am on Saturday and Sunday, 25-26 March.
So, as Jonathan says, today is the first of four crucial home games for Sam Allardyce's side.
Leicester, Burnley and Hull will all visit Selhurst Park before the end of the season in games which could go a long way to deciding Palace's fate.
And when you look at the rest of the Eagles' fixtures, today looks even more crucial...
They will face Chelsea, Tottenham, Liverpool, Manchester City, Arsenal, Manchester United and Southampton between now and the final day.
BBC Match of the Day commentator
This is the first of four huge home six pointers for Palace against relegation rivals. They'll need 10 points from them. They also have all of the top six to play as well!
Back-to-back wins have given them hope of staying up but they must win this.
Watford can make themselves safe in three successive winnable games before a big summer clearout that could include the head coach. Walter Mazzari probably needs to better last season's points tally to survive.
Big Sam Allardyce got in a tizz about the Hornet's mascot at Xmas. He'll be hoping to avoid a nasty sting in the tail this time.
Watford manager Water Mazzarri says his team cannot commit any mistakes against in-form Crystal Palace.
"Palace are one of those teams that, when you look at their squad, nobody thought when we started that it would have fought relegation," he said.
"We will play them in their best moment as they come from two positive results.
"They've got an important fan base so it won't be easy."