A hat-trick from James Scanlon ensured victory for Tom Curtis's side, with our young Reds having been tested throughout by the Portuguese outfit.
Goals from Rafael Mota and Martim Peixoto made it a close contest in Leigh, but United did enough on a cold evening to ensure victory in the competition.
It took the Reds just eight minutes to go ahead, with Jayce Fitzgerald opening up a wonderful opportunity for Scanlon.
The United midfielder danced around the Sporting backline before finding the Gibraltar international in hauds of space, as he delightfully curled an effort in the back of the net.