Raul Jimenez scored on a penalty kick in the 93rd minute and Mexico ended Haiti's impressive Gold Cup run in the semifinals with a 1-0 victory on Tuesday night.
Mexico dominated possession, yet could not find a way to put the finishing touches in Haiti's end, allowing Les Grenadiers to hang around and build confidence while playing to a scoreless tie in regulation.
El Tri moves on to face defending champion United States or Jamaica in Sunday's final at Chicago's Soldier Field.
Mexico, a seven-time Gold Cup champion, arrived in the desert as an overwhelming favorite against the young, confident Haitian side.