The 2007 tournament was the first since 2002 to not include all Major League Soccer teams. Instead, MLS had eight teams in the tournament; six  qualified automatically, while the remaining six US-based sides participated in a playoff for the final two positions.
The 2007 tournament differed from previous ones in that it was the first time since 2002 that not all Major League Soccer teams were participating. The MLS roster consisted of eight teams, with six automatically qualifying and the other six US-based teams competing in a playoff to secure the final two spots.