New manager Juergen Klopp saw the best result since his arrival to Liverpool as the Reds beat Premier League title chasers Manchester City 4-1.
A stunning first-half display of high pressing and counterattacking saw Klopp’s side, which move to within six points of a Champions League berth, surge into a three-goal lead at the Etihad Stadium on Saturday, reported Xinhua news agency.
It was the first time since February 2003 that City had conceded three goals before the interval in a league fixture.
Firmino enjoyed his best performance in a red shirt since joining the club from German side Hoffenheim for a reported fee of 29 million pounds ($45.8 million). He was flanked by compatriot Coutinho, who continues to thrive under Klopp. The pair were involved in all three goals as Liverpool established a firm hold on the game.
City slipped to third on 26 points, two adrift of new league leaders Leicester, while Liverpool move up to ninth with 20 points.