Both Manchester clubs have a chance to return to the summit tonight.
Leicester City are top of the Premier League table.
Goals from Wilfred Ndidi and James Maddison gave them a 2-nil win at home to Chelsea last night.
A fifth defeat in eight Premier League games has heaped further pressure on Chelsea boss Frank Lampard.
Foxes manager Brendan Rodgers isn't getting carried away by his team's lofty position.
West Brom had a night to forget on all fronts at West Ham.
A 2-1 defeat leaves them five points from safety, having played two more games than the two sides directly above them.
They're also facing a Premier League investigation.
Before last night's encounter, manager Sam Allardyce said Robert Snodgrass had been left out of his side due to an agreement with West Ham.
Southampton will host Arsenal in round 4 of the FA Cup.
A much changed Saints side beat Shrewsbury 2-nil last night.
Leicester's grip on the Premier League summit may be a brief one.
Both Manchester clubs have the chance to go top tonight.
First up are City at home to Aston Villa from 6pm.
United are away to Fulham from 8.15.
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