From the U.S. Soccer press release:

In six matches between the U.S. U-23’s and Mexico since 1992 (when Olympic soccer was first designated as an Under-23-tournament), the USA has gone 5-2-0, including a victory during the squads last matchup on Feb. 29, 2012 by a score line that has become familiar for these two rivals: 2-0.

Mexico, the defending Olympic champion, went an undefeated 10-0-1 in its 11 matches in 2012 on the way to the gold medal and will look to continue that success with the 20-man roster it has brought to Carson for this match.

The 2015 CONCACAF Men’s Olympic Qualifying championship will be played in the United States from Oct.1-13.