Leicester City equalled the 24-year-old record for the biggest ever Premier League victory as 10-man Southampton were dismantled at a rainswept St Mary’s.
The victory sees Brendan Rodgers’ side climb into second place, leapfrogging Manchester City and moving five points behind leaders Liverpool.
The result, which matches Manchester United’s 9-0 win against Ipswich in 1995, was only confirmed in stoppage time thanks to Jamie Vardy’s penalty.
Both Vardy and Ayoze Perez scored hat-tricks, with the visitors aided by Ryan Bertrand’s red card for a reckless challenge on Perez in the build-up to Ben Chilwell’s opener.
That opened the floodgates for Leicester, who turned on the style just two days before the first anniversary of the helicopter crash that killed the club’s former chairman Vichai Srivaddhanaprabha and four other people.
Youri Tielemans also scored his third goal of the campaign and James Maddison added a superb free-kick on a miserable evening for Southampton, who drop into the bottom three.
Leicester may have played a game more than Liverpool but this emphatic result means that they have now scored more goals than the league leaders and are just four behind Manchester City.
And the omens look good for Rodgers’ side who have now collected one point more from the opening 10 games of the current season than at the same stage of their title-winning campaign in 2015-16.
With trips to Crystal Palace and Brighton on the horizon either side of hosting Arsenal, Leicester have every chance to kick on from their strong start, but given the strength and form of Liverpool and Manchester City, a title challenge appears unlikely.
But the manner in which the Foxes ruthlessly cut through the hosts will nevertheless serve as a warning to others, with their three goals inside the opening 19 minutes the fastest they have amassed that scoreline in a Premier League match since 1998.
Also working in Leicester’s favour is the attacking menace still being provided by Vardy.
While the forward is approaching his 33rd birthday, there are few signs, if any, that his physical capabilities are waning and he looked as sprightly as ever as he recorded his first hat-trick for almost three years.
His first showed nimbleness and awareness as he cut inside Saints defender Maya Yoshida to drill a close-range effort into the bottom corner, while his second showcased smart movement as he headed past Angus Gunn from close range. His trademark blistering pace then took him clear of the Southampton defence to win and convert a late penalty.
His exploits were also complemented by Perez, who opened his account for the season after finding the bottom-right corner following a neat one-two with Tielemans.
The Spaniard then superbly swept home Chilwell’s pinpoint cross for his second before finding the bottom corner with a left-footed shot to complete his treble.
At the start of the evening Southampton’s focus was purely on ending a barren run of seven games without a home win dating back to April.
But by half-time manager Ralph Hasenhuttl had changed tack considerably, by simply trying to avoid any further embarrassment.
The Austrian, who at times appeared exasperated and spent much of the interval sitting in his technical area, introduced Kevin Danso and Jack Stephens to replace Jannik Vestergaard and Danny Ings, but it was too little to late.
With the crowd visibly thinning in the second period, Hasenhuttl must now hope the scale of this defeat has not eroded the confidence of his players too much.
While the Saints are a couple of points better off than at the same time last term, they appear in danger of being dragged into another relegation fight.
And their road to redemption is unlikely to be an easy one with their next two fixtures away at Manchester City in both the Carabao Cup and Premier League.
Southampton travel to Manchester City in the Carabao Cup on Tuesday (19:45 GMT) before returning to the Etihad in the Premier League on Saturday, 2 November (15:00 GMT).
Leicester travel to Burton in the EFL Cup also on Tuesday (19:45 GMT) before going to Crystal Palace in the Premier League on Sunday, 3 November (14:00 GMT).