Roberto Firmino added a fifth in the second half as the Gunners slumped to a heavy defeat. Arsenal may have felt unlucky to have the decision go against them, but it was clumsy from the Greek defender.
Nerves? Pressure? Not here as, led by Roberto Firmino's hat-trick, they gathered themselves in seconds and simply blitzed Arsenal. Lucas Torreira wasn't himself, Mesut Ozil was out injured, and the defense of the Gunners looked as hopeless as anyone can remember in recent memory.
And the Liverpool star couldn't keep a beaming smile off his face as he wheeled away towards the home fans with the points looking all wrapped up with 45 minutes still to play.
Arsenal hasn't beaten Liverpool in their last seven games in all competitions (three losses, four draws) and also is winless in its last five Premier League games at Anfield (two draws, three losses), having conceded 17 goals in the latter stretch.
The Brazil global scored his second goal two minutes later when Firmino managed to evade two challenges and net just his second goal of the season at Anfield.
Absolutely brilliant, and boy is that a welcome sight for the Reds.
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The fine form of Scotland captain Andy Robertson for the Premier League leaders has reduced chances for Moreno, who has been out of action with a back injury, to play. He hadn't been particularly sharp from the penalty spot as of late and hadn't been scoring, but he solved both of those issues on Saturday.
After conceding in the 11th minute, Liverpool showed they had title-winning credentials to bounce back nearly immediately and turn the game on its head, with two Firmino goals in two minutes turning the game back in the home side's favour. It would be silly to say such a thing, especially considering we are at the halfway point.
Premier League giants Chelsea are understood to have reached an agreement to sign Christian Pulisic from Borussia Dortmund at the conclusion of the ongoing campaign.
Moreno captained Liverpool in pre-season and in November 2017 he missed the birth of his child so he could feature in a 3-0 win over Southampton.
A ninth successive Reds victory made it 31 league matches without defeat at Anfield, their joint-third longest run, and extended their unbeaten start to 20 matches. Nobody could have ever dreamed this.