This is the 14th season the Seattle Sounders have played in MLS. In fully half of those seasons, they’ve qualified for Concacaf Champions League. That’s tied for both the most appearances and best qualification percentage of any team in MLS.
Still, I have a feeling there’s a good deal of unfamiliarity with this continent’s equivalent to the more famous UEFA Champions League. With the Sounders as close as ever to their first finals appearance in this tournament, now seems like as good a time as any to do a quick refresher: