There were plenty of surprises from Saturday's round of fixtures, with Wolverhampton Wanderers and Lincoln City both enjoying shock victories.
Wolves travelled to Anfield where they inflicted Liverpool's third defeat of the week to knock Jurgen Klopp's men out of the cup.
And it was a particularly historic day for Lincoln after they beat Championship side Brighton to reach the FA Cup fifth round for the first time in 115 years.
Elsewhere, Chelsea and Manchester City both cruised through to the next stage of the cup while Tottenham recovered from a goal down to see off League Two team Wycombe Wanderers at White Hart Lane.
As for today, there's just four games on the cards. Millwall take on Watford, Fulham welcome Hull to Craven Cottage, Sutton United go head-to-head with Leeds and Warren Joyce returns to his former club as Wigan face Manchester United at Old Trafford.
If yesterday is anything to go by we should be in for another day of thrills and spills.
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70 MINS
Substitutions: Fellaini is replaced by Herrera
:Grigg is replaced by Tunnicliffe
72 MINS
United are in cruise control at the moment, as Wigan look lacklustre in their attempt of a comeback. Joyce's men look out of their depth when United begin to play their quick football and it has the feel of a game with more goals to come.
74 MINS
GOAL
MANCHESTER UNITED 3 - 0 WIGAN ATHLETIC
Mkhitaryan has scored the third for United to put this fourth round FA Cup to bed. Mkhitaryan begins the move and feeds Martial, who makes space and delivers the ball back to the 28-year-old, who clinically slots the ball into the net.
79 MINS
United are passing the ball well and are just confidently controlling the tempo of the game. Wigan battle relentlessly to avoid further humiliation.
Martial comes close to scoring the fourth, only to be denied by a defensive block inside of the danger zone.
81 MINS
GOAL
MANCHESTER UNITED 4 - 0 WIGAN ATHLETIC
Herrera heads down a United corner into the path of Schweinsteiger, who pokes home the home side's fourth of the afternoon. That goal even raised a smile from Mourinho on the touchline - so it must have been good.
It's all over for Wigan.
84 MINS
Wildschut leads a Wigan attack, but Smalling comes out on top and redeems possession for the Premier League side. He's been tremendous at the back today.
87 MINS
Martial buries for the fifth for Mourinho's men, but the whistle had blown before the Frenchman struck the ball. The referee stopped the game for a high foot from Schweinsteiger.
FULL TIME
MANCHESTER UNITED 4 - 0 WIGAN ATHLETIC
United progress to the last sixteen, thanks to goals from Fellaini, Smalling, Mkhitaryan and Schweinsteiger. It was a very comfortable and professional display from United, despite Wigan showing glimpses of brilliance prior to the half term interval. Mourinho's men were disciplined, organised and achieved what they set out to today.
This will give Wigan a chance to focus on escaping the relegation zone in the Championship, but should take credit for a resilient display.
That's all from us today - thanks for tuning in.
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