First-half goals from defenders Omar Gonzalez and Eric Lichaj yesterday secured a hard-fought quarter-final win for the hosts, who are chasing their first Gold Cup title since 2013.
However Bruce Arena's side were made to work all the way by El Salvador, and only some superb saves from Tim Howard kept the Central American side at bay at Philadelphia's Lincoln Financial Field. An unconvincing start saw the hosts given a let-off early on when Lichaj under-hit a back pass to Howard.
The remainder of the first half was dominated by a series of niggly fouls as El Salvador frustrated American efforts to impose themselves on the contest.
The Americans were unlucky to be denied an opening goal midway through the half when Clint Dempsey released Gyasi Zardes who lifted his finish above Derby Carrillo, only to be flagged for offside.
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Replays later showed the Los Angeles Galaxy forward was onside.
Four minutes before halftime however, the US broke the deadlock when Gonzalez leaped to glance in Michael Bradley's teasing free-kick to make it 1-0.
Deep into first half stoppage time, Lichaj made it 2-0 with a goal that owed everything to the guile of Bradley.
The veteran striker left Henry Romero for dead with a brilliant turn and then slipped a pass into the feet of Lichaj, who controlled to shoot beneath Carrillo for his maiden international goal.
The Americans now face 2014 World Cup quarter-finalists Costa Rica in Saturday's semi-finals.
The Central American rivals were deadlocked in the second half when Costa Rica's David Guzman swung a long free kick toward the Panamanian goal.
Panama's Godoy leapt to try to head the ball away but instead it spun back into the Panamanian net in the 77th minute.
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