Liverpool suffered their first Premier League defeat since January 2019 after being humbled 3-0 away to Watford thanks to a double from Ismaila Sarr.The Reds, who missed the chance of setting a top-flight record of 19 straight wins, were well below par for the opening half, mustering only one effort.Nigel Pearson's side created the better chances with Gerard Deulofeu and Troy Deeney going close. But the Hornets were dealt a huge blow when Delofeu appeared to twist his right knee after being outmuscled by Virgil van Dijk and was stretchered off.But the home side continued to dominate after the break and got their rewards when they took advantage of some poor defending with Abdoulaye Doucoure finding Sarr who scored from close range.The Hornets were buzzing minutes later when a clever pass from Deeney sent Sarr through on goal to loft the ball over Alisson for his second.And the hosts were in dreamland when Sarr capitalised on a poor backpass from Trent Alexander-Arnold and unselfishly set up Deeney to score his side's third.The result means Liverpool still need more 12 points to clinch their first title since 1990 while Watford climb to 17th position.