Leicester scored five first-half goals and another four after the break to destroy 10-man Southampton 9-0 on Friday and tie the biggest win in Premier League history.
Manchester United beat Ipswich by the same score in 1995, three years after the English top tier was rebranded.
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Brendan Rodgers' Leicester moved to second in the league as Ayoze Perez and Jamie Vardy both scored hat-tricks at a wet St. Mary's stadium.
"We actually found out at 6-0 when Jonny Evans came sprinting over and said if we carry on doing what we're doing we can get the record," Vardy told Sky Sports. "We've gone all the way to the end and managed to do it."
Social media went into meltdown after the record-equalling haul.
20 - Leicester have earned 20 points from their opening 10 Premier League games of 2019-20; one more than at the same stage of their title-winning 2015-16 campaign (19), and their joint-most ever in a top-flight season, along with 1930-31 (adjusting to 3 points/win). Inspired. pic.twitter.com/o4YSZ80lbI— OptaJoe (@OptaJoe) October 25, 2019
If Leicester win the Premier League title it will be the most incredible achievement in English football since Leicester won the Premier League title.— Sachin Nakrani (@SachinNakrani) October 25, 2019
Leicester is trying to score Manchester United’s total League goals this season In one single match smh— Kay 💧 (@Kaypoisson1) October 25, 2019
We all agree this Leicester team is better than the one that won the league?— Dean Jones (@DeanJonesBR) October 25, 2019
Southampton's Ryan Bertrand became the first Premier League player to receive a red card after a VAR review, doing so for an incident in the buildup to Leicester's first goal in the 10th minute.
Leicester trail Liverpool by five points and are ahead of third-place Manchester City by one point. Man City host Aston Villa on Saturday and Liverpool host Tottenham on Sunday.
Ben Chilwell scored the opener for the Foxes on Friday night when he side-footed home after Southampton goalkeeper Angus Gunn could only parry Harvey Barnes' initial effort. Southampton quickly received another blow when Bertrand was ejected on review for stretching over the top of the ball with his studs and making contact with Perez's shin before the goal.
It got worse for the hosts when Leicester broke down the left to make it 2-0 in the 17th after Youri Tielemans fired in a low effort from the centre of the box following good work by Barnes down the left wing.
Tielemans then set up Perez who made it 3-0 inside 20 minutes with his first goal for the club.
Chilwell's cross picked out Perez, whose impressive strike put the visitors 4-0 ahead in the 39th, and Vardy had time to add a fifth before the break with Southampton jeered off the field.
Perez got his hat-trick in the 57th and Vardy triggered an exodus of Saints fans with his second goal a minute later for 7-0, rising to head in Chilwell's cross.
With the rain continuing to pour and St Mary's rapidly emptying, Maddison added his name to the scoresheet in the 85th. His curling free kick from just outside the box made it 8-0 - the scoreline by which Manchester City beat Watford earlier in the season.
Vardy scored from the penalty spot right at the end for his hat-trick as Leicester equalled the Premier League's record winning margin in stoppage time, after Vardy had been brought down by Jan Bednarek.
Southampton manager Ralph Hassenhuttl said: "I take 100 per cent responsibility for this result. This cannot happen like this. For me, I've never had such an experience in my entire managing career."
As well as matching Man United's 9-0 win against Ipswich, Friday's rout sets a new marker for EPL away victories, exceeding United's 8-1 win at Nottingham Forest in 1999.