Bruno Fernandes played the through ball for our no.10 to net the only goal of the game, while Marcus's fellow forwards never stopped working in trying to find a breakthrough.
Midfielders Nemanja Matic and Paul Pogba kept things solid and goalkeeper David De Gea had to make some good saves to prevent the visitors from taking the lead.
The Spaniard claimed a fourth league clean sheet of the season at Old Trafford and, despite his sharp reflexes, much of that was down to the defence in front of him. In particular, Eric Bailly, who was starting a third consecutive game for the first time since March 2018, shone for the Reds after overcoming various injury problems during the early months of the campaign.