Steve Cherundolo helped set up the first goal from his right back position, earning the corner kick that lead to Michael Bradley's goal, but the United States right back has already had to come out of the match. He looked to have picked up a knock when he earned that corner and as a result, called to Bob Bradley for a substitution. Early indications are that he has a left ankle injury. Without a like for like replacement on the bench, Bradley opted to make some moves and bring in Jonathan Bornstein.
Bornstein has been error prone in the past and has drawn criticism from USMNT fans, but he actually had a relatively error-free World Cup, making himself back into a reasonable option for the team. He's a left-footed left back, so he hasn't come in as a direct replacement for Cherundolo. Eric Lichaj, who started the game at left back, is right-footed and has played more right back than left back in his career, so the switch to Cherundolo's position was natural for him.
For more on how the two teams got to this point, check out our USA vs. Panama stream and our Mexico vs. Honduras stream. For more updates leading up to USA vs. Mexico, bookmark this StoryStream. For all of our previous Gold Cup coverage, check out the Gold Cup 2011 section. For more on Mexican football, including the Mexican national team, the Mexico vs. USA game, and the Mexican Primera, check out SB Nation's Mexican football blog FMF State Of Mind.