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I am more than willing to admit that I'm biased when it comes to this statement, but there is no greater rivalry in the MLS than Portland and Seattle. In all actuality, I don't think this is even a close call.
This rivalry has been going on since long before these two teams were brought into the MLS and has only gotten more intense since both teams became part of the league. The games have sold out CenturyLink Field (home of the Seattle Seahawks) on more than one occasion and claims four of the top seven all time attendance records in the MLS.
My beloved Timbers have been on the losing end of this rivalry more often than I would like (MLS = 7 - 3 - 4 (Seattle)/ All Time = 41 - 27 - 10 (Seattle)), but every game almost always comes down to a single goal that determines the winner and every game is always so spirited that most people in attendance exit the game with a hoarse voice.
What do you think? Does your favorite teams rivalry beat this one or do you agree with me that this is the best rivalry in the MLS?