Sadio Mane has scored his 100th English Premier League goal while Roberto Firmino bagged a hat-trick as Liverpool re-claimed top spot with a 5-0 win over Claudio Ranieri's woeful Watford.
It was a nightmare first game in charge for Ranieri who took over as Watford boss on October 4 following the sacking of Xisco Munoz.
Visitors Liverpool took the lead in the ninth minute when Mohamed Salah provided a sublime pass to Mane with the outside of his left boot for the Senegalese striker to notch his Premier League century.
Mane then picked out James Milner on an overlapping run and he drove a perfect ball across the goal for Firmino to steer home from close range in the 37th minute to put the Reds 2-0 up at half-time.
Firmino added his second seven minutes after the break by pouncing on a defensive mistake before Salah outwitted three defenders in a tight space and scored himself two minutes later.
Firmino added his third in second-half stoppage time.
The win lifts Liverpool back to the Premier League summit on 18 points, two ahead of Chelsea who can re-take the lead if they beat Brentford in Saturday's late game.
Watford are 15th on seven points.
Australian Associated Press