United States' Clint Dempsey works out during a training session in Sao Paulo, Brazil, Saturday.The Associated Press

United States' Jozy Altidore, left, works out with trainer Masa Sakihana during a training session in Sao Paulo, Brazil, Saturday.

United States' Chris Wondolowski works out during a training session in Salvador, Brazil, Monday. The U.S. will play against Belgium Tuesday, in the second round of the 2014 soccer World Cup.

United States' Clint Dempsey, center, and Matt Besler, left, work out during a training session in Salvador, Brazil, Monday.The Associated Press

Belgium's captain Vincent Kompany, center, who is recovering from an injury, takes part in a training session at Estadio Manoel Barradas the day before the World Cup round of 16 soccer match between Belgium and USA at Arena Fonte Nova in Salvador, Brazil.The Associated Press

Carolyn Ramirez and her daughter, Lia, United States soccer fans, watch a World Cup soccer match between the United States and Germany at a viewing party at Taverna Opa cafe lasy Thursday in Miami. In Tuesday's match against Belgium, the American team will look to attack their opponent with more frequency than they managed in their 1-0 loss to the spotless Germans.