After starting their game against El Salvador poorly, Mexico came to play in the second half and absolutely crushed El Salvador, thanks to a lucky goal by Efrain Juarez, a great substitution by Jose Manuel 'Chepo' de la Torre, and a hat trick by 'Chicharito' Javier Hernandez.
The first half was downright terrible, with Mexico looking like a team of strangers and El Salvador playing a generally dirty game. Mexico started the second half poorly too, but a lucky goal by Efrain Juarez, scored unintentionally with his head off of a rebound. At that point, Mexico were no longer afraid of losing and the floodgates opened.
Aldo de Nigris game on as a substitute for Israel Castro, who had a bad game, and immediately scored Mexico's second goal. Hernandez would then score Mexico's next three goals, with the final coming on a penalty kick, which was drawn on a foul that Marvin Gonzalez was shown a red card for. It was an absolutely massive half for Mexico and Hernandez, and with both El Tri and Costa Rica winning by five goals, the final game of Group A looks like it's going to be a classic.
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.