Liverpool manager Juergen Klopp has congratulated Watford after they became the first team in the Premier League this season to beat the Reds.
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The lowly Hornets won 3-0 win at Vicarage Road in an impressive performance from Nigel Pearson's side.
A second-half brace from Ismaila Sarr put the hosts in control before the Senegal attacker set up Troy Deeney 18 minutes from time to provide the cherry on top.
It ended the Reds unbeaten run of 44 league games, meaning they fall short of matching Arsenal's Invincibles from the 2003-04 campaign, who had gone the season and overall 49 matches without defeat.
The first Premier League loss for Liverpool in over a year does little to their hopes of winning the title but they missed out on including equalling Manchester City's run of 19 straight top flight wins.
"I am not surprised by the performance because that would mean I never saw something like that before. I saw it a lot of times," Klopp said.
"What I can say and I think is 3-0 is a bit harsh but we had a big hand in that so we don't have to think about that.
"The most important thing is congratulations Watford, well deserved. That is what should be the headline.
"We didn't perform like we should have and Watford performed exactly like they wanted."
After losing at Atletico Madrid in the Champions League last week, Liverpool have now suffered two defeats in three games in all competitions.
When quizzed on missing out on joining Arsenal as invincibles, Klopp again reiterated he was not focused on that achievement.
"I don't think you can break records because you want to break records, you break records because you are 100 per cent focused on each step you have to do," he said.
"Tonight we were not good enough and it is not a plus for me that in history they will look back in 500 years and say Liverpool nearly did it."
The win lifted Watford out of the relegation zone on goal difference but Pearson insisted now was not the time to get carried away.
"I am already looking at the next game in my own mind... It is a very satisfying and fantastic win but with 10 games left we have got an awful lot of work to do," he said.
Australian Associated Press