Unrealized Non-Regular Season MLS Matchups

MLS teams have played each other many, many times outside of the regular season. Mostly through the playoffs and the US Open Cup, but also in the Champions League and the Superliga. What I sought to find out was, which matchups have not yet occurred outside of the "league" (regular season)? One such matchup that will happen in two weeks for the first time is Chivas USA vs New England in the Superliga. Unfortunately, the geographical pairings in the Open Cup and the separation of conferences in the playoffs means that some teams will rarely get the chance to meet in one of those competitions. That's why it's exciting when we get to such a matchup. Who will be the first team to play all others? The very first non-league matchup between MLS teams was the 1996 Open Cup quarterfinal between Colorado and Kansas City on September 15th of that year. The Rapids won 3-2 away with two goals from Chris Henderson. Here's a complete list of who each team has yet to meet: CHICAGO Chivas USA Houston Real Salt Lake Toronto CHIVAS USA Chicago Colorado Columbus Dallas DC United New England New York Real Salt Lake San Jose Toronto COLORADO Chivas USA Columbus New England New York San Jose Toronto COLUMBUS Chivas USA Colorado Houston Toronto DALLAS Chivas USA Real Salt Lake San Jose Toronto DC UNITED Chivas USA Real Salt Lake San Jose Toronto HOUSTON Chicago Columbus New York Real Salt Lake San Jose Toronto KANSAS CITY New England New York Toronto LOS ANGELES Real Salt Lake Toronto NEW ENGLAND Chivas USA Colorado Kansas City Real Salt Lake San Jose Toronto NEW YORK Chivas USA Colorado Houston Kansas City Real Salt Lake San Jose Toronto REAL SALT LAKE Chicago Chivas USA Dallas DC United Houston Los Angeles New England New York Toronto SAN JOSE Chivas USA Colorado Dallas DC United Houston New England New York Toronto TORONTO Chicago Chivas USA Colorado Columbus Dallas DC United Houston Kansas City Los Angeles New England New York Real Salt Lake San Jose Former Teams Not counting matchups that couldn't occur: Miami never played COL, DAL, LA, NE, or TB. Tampa Bay never played CHI, DAL, KC, MIA, NE, or SJ.