New boys Guyana produce a spirited effort against the US.
But a Tyler Boyd double gives the Gold Cup hosts a winning start to their campaign.
Comprising players from the lower reaches of the English football pyramid and a goalie who plays for SV Walking Boyz Company Guyana made their debut at the Gold Cup.
Despite the odds, they put up a spirited effort and were often pressing the hosts' defence.
But not surprisingly they never had quite enough in the final third to really trouble Zach Steffen in the US goal.
Newport County's Keanu Marsh-Brown came the closest for the rank underdogs.
At the other end Turkey-based Tyler Boyd contributed a double including a fine finish from an excellent Bradley pass.
Arriola had opened the scoring in the 28th minute and from then onwards there never looked like being a shock.
Columbus Crew striker Zardes was even credited with a bizarre goal when a ricochet hit him and went into the net.
Luck was also on the American side.
So no upset in the impressive new Allianz Field in Saint Paul and a solid start to the US attempt to match Mexico's seven Gold Cup titles.
report & analysis - John Bethell