From reading the following: "The aggregate goal format which will be employed at the Conference Semifinal stage for the first time in League history follows the lead of various international competitions, including the Copa Libertadores (annual South American club championship) and the CONCACAF Champions Cup (annual club championship involving teams from CONCACAF). In a fashion similar to those competitions, the team that scores the most goals in the home-and-away series will advance to the Conference Final. If the teams have scored the same number of goals after 180 minutes, a 30-minute golden-goal overtime will be played followed by a penalty kick shootout, if necessary." at http://www.mlsnet.com/special/mlscup/2003/mlscuppo_format.html it appears that there is no weighted away-goals clause for the home-and-away first round playoff series. has there every been any reasons given for MLS going with the straight aggregate goals format? is there a difference in the 2 game system used in Europe versus the system used in the Americas?