Jamaica began their Gold Cup campaign with a comfortable 4-0 win over unfancied Grenada at California's Home Depot Centre.
Having scored only once in the three matches in the last Gold Cup two years ago, Jamaica went into the game with coach Theodore Whitmore calling for a more ruthless edge in front of goal.
They had plenty of chances against Grenada and found the net after 21 minutes when Luton Shelton deftly slotted home Rudolph Austin's pass.
It was 2-0 after 39 minutes, Ryan Johnson converting Dane Richards' pinpoint delivery. Demar Phillips and Omar Daley added to the tally in the final 11 minutes.
In the day's other game, Honduras missed a golden opportunity to kick their campaign off with victory over nine-man Guatemala.
Guatemala started brightly but almost went behind when Oscar Garcia struck the woodwork.
Their chances took a hammer blow when Gustavo Cabrera was shown a second yellow card in in the 61st minute and despite another dismissal, this time for substitute Henry Medina, Honduras could not find the breakthrough.