Liverpool's Premier League title-winning celebrations were slightly dampened as they were thrashed by deposed champions Manchester City.
Jurgen Klopp's side ended an agonising 30-year wait for the top-flight title when City lost at Chelsea last week, but were resoundingly hammered on their return to action.
The Reds, who were given a guard of honour by the hosts before kick-off, could have taken the lead at Etihad Stadium but Mohamed Salah's low drive cannoned off the post.
It proved costly as Pep Guardiola's men took complete control with a devastating first-half display in which they scored three goals within 20 minutes.
The sublime Kevin de Bruyne converted the opener from the penalty spot after Joe Gomez hauled down Raheem Sterling and the England international finished off a swift counter-attack for the second.
Midfielder Phil Foden further enhanced his reputation as a star in the making, coolly slotting home before half-time following a quick one-two with De Bruyne.
City scored their fourth in the second half when Alex Oxlade-Chamberlain inadvertently slid the ball into his own net from Sterling's low drive.
Elsewhere, Sheffield United climbed to seventh in the Premier League table thanks to a 3-1 victory against Tottenham Hotspur.
Sander Berge's clinical low finish fired the Blades into the lead on 31 minutes, just before Spurs striker Harry Kane had a goal ruled out for a handball by Lucas Moura after a VAR check.
David McGoldrick hit the side netting for Sheffield United after the break before substitute striker Lys Mousset doubled the lead on 69 minutes.
A close-range finish by Oliver McBurnie, turning in Berge's cross on 84 minutes, completed an impressive display by Chris Wilder's team before Kane netted a 90th-minute consolation for the visitors.
Sheffield United are in seventh, with 47 points, while Spurs drop to ninth, with 45.
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