United began the defence of the Premier title at Northern Ireland's Milk Cup with a convincing 3-0 win over local side County Antrim.
The Reds were 2-0 up and cruising by half time, before adding a third after the break.
Irish winger Robbie Brady scored twice, before first-year Academy scholar William Keane got the other in front of an ever-enthusiastic crowd at Ballymena Showgrounds.
Ravel Morrison's straight red card soured the start of the tournament for Paul McGuinness' side, but overall it was a pleasing first match for the young Reds squad, which contains just two of the players who lifted the trophy last term.
United are in action again on Tuesday against Peruvian side Club Cantolao, at Coleraine Showgrounds.