Danny Ings gave in-form Southampton sweet revenge over Leicester City and Manchester United hammered bottom side Norwich City in the Premier League on Saturday.
Leicester consigned the Saints to a record-equalling 9-0 defeat in October, but the second-placed Foxes – who had three goals ruled out – were beaten 2-1 at the King Power Stadium less than three months later.
Ings' 10th goal in his last 10 top-flight starts sealed all three points for a Southampton side who have now won three and drawn one of their last four Premier League matches.
Manchester United replaced Sheffield United in fifth spot with a 4-0 drubbing of Norwich at Old Trafford, Marcus Rashford scoring twice, after Pierre-Emerick Aubameyang scored and was sent off in Arsenal's 1-1 draw at Crystal Palace.
Chelsea are five points better off than the Red Devils in fourth, having avoided a third successive Premier League home defeat with a 3-0 victory over Burnley.
Richarlison scored the only goal in Everton's win over Brighton and Hove Albion at Goodison Park, while Newcastle United and Wolves had to settle for a 1-1 draw at Molineux.
INGS KEEPS SAINTS MARCHING
Southampton pulled off a magnificent victory to leave high-flying Leicester stunned.
Jamie Vardy, Kelechi Iheanacho and Jonny Evans had goals disallowed for offside and Southampton had a penalty decision overturned by VAR in an action-packed encounter.
Ralph Hasenhuttl's upwardly mobile side were not to be denied maximum points, though, courtesy of a deflected first-half strike from Stuart Armstrong and a 14th of the season in the league from Ings – who hit the crossbar twice – either side of Dennis Praet's first Leicester goal.
RUTHLESS UNITED HAMMER CANARIES
Manchester United responded to their 3-1 EFL Cup semi-final defeat to Manchester City with a ruthless demolition of bottom side Norwich.
Rashford took his tally of league goals this season to 14 with one in each half and Anthony Martial scored United's third two minutes after the England striker helped himself to a double from the penalty spot.
Mason Greenwood was given far too much time to add a fourth soon after coming off the bench as Ole Gunnar Solskjaer's side ran riot, leaving Norwich still seven points adrift of fourth-bottom Aston Villa.
AUBA AND OUT
Aubameyang's 15th top-flight goal of the campaign gave the Gunners a first-half advantage at Selhurst Park, but things turned sour for the striker after the break.
The Gabon international was initially booked by referee Paul Tierney for a challenge on Max Meyer, but a red card was brandished after a VAR review which took over two minutes.
Jordan Ayew's deflected strike had brought injury-hit Palace level before Aubameyang was ordered off and neither side could force a derby winner.