They nearly got off to the best possible start when Gomes found room to get a shot in, however his sent his shot high over the crossbar.
USA's first chance came on six minutes, when defender Valentin's flying header from a right wing corner flashed wide of the far post.
Three minutes later Portugal took the lead with a fine goal from the impressive Bruno Gama. He played a neat wall pass with Gomes, who backheeled the ball back to Gama, and the winger cut inside, took his time and eventually curled an effort into the back of the net to spark off wild celebrations amongst the players.
Portugal were on top at this stage, and nearly added to their lead when defender Rodrigues' freekick was tipped onto the crossbar by the USA keeper.
Vitor nearly got a second for Portugal after going on a powerful run down the left, but his shot couldn't find the target as his shot flashed into the side netting.
Striker Gomes had a great chance to add to Portugal's one goal just before the half hour after intercepting a poor backpass he advanced towards goal and sent a cheeky chip over Sandbo but his shot sailed over the bar.
USA broke on the counter attack a minute later, and despite looking offside the flag stayed down as Hidalgo found himself unmarked in the area he could only shoot straight at the Portugal keeper.
The final chance of the half fell to the USA, but young Rogers could only fire straight at the keeper from a tight angle.
HALF TIME - PORTUGAL 1-0 USA
The second half saw plenty of chances early on, with Hidalgo dragging a shot wide for USA, while Marques, Barbosa and Gama came close for the leaders, and they didn't have to wait long to extend their lead.
Gomes, who lead the line well all afternoon, cut inside from the right wing, took on two defenders before slotting the ball past the keeper, in off the post.
He nearly added his second five minutes later, after good ballwork he found space to fire a shot at goal, but he shot wide of the mark.
USA went forward looking to pull a goal back, but they just couldn't find the net despite Hidalgo going close on a number of occasions, before Portugal rounded things off in injury time.
Marques whipped a free kick into the area with his left foot that drifted past everybody, including the keeper, and nestled nicely in the back of the net to complete the scoring and send the whole Portugal squad into over the top celebrations.
FULL TIME - PORTUGAL 3-0 USA
Tom Loakes is a reporter with Notts County MAD.
