Someone might want to let the Mexican national team that they are currently playing a competitive football match. They have gotten off to a very slow start, and they're looking quite shaky. There's no question that they're a much more talented side than El Salvador, but their opponents have come out with a much different level of intensity and focus that El Tri will have to match quickly.
There's not really anything to be worried about yet for their fans, as it is quite early, but they almost paid for their slow start when El Salvador's Eliseo Quintanilla cracked a free kick off the crossbar, stunning Guillermo Ochoa. Mexico's defending on the ensuing free kick was a bit random and chaotic, and they should be happy that they still have a clean slate to work with on the scoreboard.
On an unrelated note, Univision's coverage so far is atrocious. They had extra commercials and joined the game late, then went to a split screen with Hugo Sanchez while the ball was in play. Simply terrible.
For more information on the Mexico Vs. El Salvador game, the 2011 Gold Cup (Copa Oro), and Mexican football in general, check out SB Nation's Mexican football blog FMF State Of Mind.