Jurgen Klinsmann insists United States still have plenty to play for against Panama in their final Group A fixture on Monday.
Defending champions USA claimed top spot with a match to spare after overcoming a spirited Haiti outfit 1-0 in Foxborough on Friday.
"The approach is picking up more rhythm, going for another three points, and finishing off the group with three wins," the German told reporters.
"We take that very seriously. We also know we have influence on who is going through, so we are not taking our foot off the pedal there. We will give it a very good game and keep on building confidence and fine tuning elements and improve our game.
"As you saw there was still some stuff that was not so good, so we keep working on that. It's a nice feeling knowing we are already first, but it doesn't mean that we are slowing down now. It should be the opposite – we've got to keep raising the bar."
Hernan Dario Gomez's Panama are a point clear of Honduras and Haiti with two points after playing out a 1-1 draw against the Hondurans on Friday.
Luis Tejada's 21st-minute opener was cancelled out by Honduras' Andy Najar with nine minutes remaining at Gillette Stadium.
