
With the pressure growing on manager Ruben Amorim after a disappointing start to the season, Mount calmed the nerves around Old Trafford with a fine early finish to break the deadlock.
United continued to dominate with a spectacular save from Sunderland goalkeeper Robin Roefs preventing Bruno Fernandes from adding a sumptuous second before Sesko netted his first Old Trafford goal after 31 minutes.
Sunderland were awarded a penalty late in the first half, a decision that was overturned following a VAR intervention, but they never really threatened after the break as United eased to a third home league win of the season.