Watford boss Nigel Pearson: "It's such an important win for us. But it is one win. Our season has been tough so far, with losing last week and not playing well, we were keen to get a response.
"They are such an outstanding side, we had to get our performance right - as close to max as possible - and I thought we thoroughly deserved the win. We threatened with the ball and defended with discipline, energy and commitment. That's been the message from day one.
"It's in our own hands, and we have to deliver that performance week in, week out."
Liverpool manager Jurgen Klopp: "They did exactly what they wanted to do, we did not. That's how football works.
"You have to accept it, it's not so easy, but it's the proof we were not good enough. It's always very difficult.
"If you win good, if you lose, try to do it in the right manner and do it like a man."
Liverpool defender Virgil van Dijk: "Credit to Watford, they played well, a lot of fight, very disciplined and scored three goals - that's the reality, we couldn't find a way through. It was difficult and we have to do better.
"The record and the talk of the records is all media, we just try to win every game.
"We will focus on the next game, the cup game, and we try to win there. We have to stay humble and work harder next game."
Watford goalkeeper Ben Foster, speaking to Sky Sports: "Just do that every week. It's easy if you do it like that - we had a game plan and stuck to it really well.
"Ismaila Sarr is a crazy good talent, he's so calm in front of goal and has electric pace. Buzzing.
"It's not hard is it, football? We stuck to our task and took our chances when they came."