Diogo Jota and the substitute Roberto Firmino scored quickfire goals at the start of the second half to give Liverpool a ninth consecutive league victory and end Arsenal’s five-match winning run.
Liverpool were below par during a tense, largely chanceless first period, the highlight of which was a series of exhilarating runs from Gabriel Martinelli.
Alisson made a brilliant save from Martin Odegaard at one end; three minutes later, Diogo Jota gave Liverpool the lead after a mistake from Aaron Ramsdale.