A first half penalty by Wilfred Zaha was enough for Crystal Palace to secure Watford's relegation to the Sky Bet Championship.
The Eagles dominated the game with 70% possession and keeping the Hornets to just one shot on target as Zaha and Michael Olise tormented the Watford defence.
After the game, Crystal Palace manager Patrick Vieira spoke to the media.
On the performance
"In the first half, we created a couple of chances that we should take and score those goals. In the second half, we didn't create very much. I thought we were a little bit sloppy in our passes, in our movement.
"But we managed to win the game and we showed maturity. We managed to control the game even when we weren't playing and that's good because we're growing up as a team and learning from those mistakes that we made from the start of the season.
"We kept our organisation and we respected the game. We won the game and that was good because at the start of the season, at times when we were 1-0 up and we get free kicks or a last-minute goal, but today we managed it much better.
The ingredients are there
"I'm really pleased because the players have been working hard and well every single day. This is a team of players who want to improve and compete in the Premier League. All the ingredients are there for us to be more solid as a team.
"It's about having the right balance between creating chances, scoring goals and being solid and not conceding goals to allow ourselves to win football matches."
Showing improvement
"It was a good win. I don't think it was our best performance but it was important to win and I'm happy with that result.
"To win by more you need to create chances. We created a couple in the first half but we didn't create enough in the second. We didn't move the ball quick enough to create those chances. I'm happy with the result but I wanted more from the team.
"We just have to keep challenging ourselves and keep improving. It wasn't our best performance and we managed to get the win, to control the game and we've shown improvement from the start of the season. On that side I'm really pleased because we're growing, players are getting more confidence and we are more solid as a team. Whether we get record points [tally], our performances will dictate that."
On Wilfried Zaha
"I believe that he can get more involved in our chances and he can score more goals because he's got that talent to put the ball in the back of the net."
The victory today lifted Crystal Palace into the Premier League top ten and with trips to strugglers Everton and Aston Villa to come, before welcoming Manchester United on the final day of the season, the Eagles will be confident of finishing the season strongly.