Including their MLS series, these two teams have met will be the 92 times across all competitions and eras. Seattle have dominated the MLS series between these two teams, though Portland have won the only MLS Cup Playoff series between them to date.
These teams met four times in 2015, with the most memorable meeting coming in a US Open Cup fourth-round match on June 16. Like most other games between these two, it was fiery. Portland got a 3-1 win, snapping a 20-game unbeaten streak at Stafire Stadium for the Sounders, who finished a wild overtime game with seven men.
A fiery rivalry, the meetings between these two teams have generally been played pretty evenly since the Whitecaps joined MLS in 2011.
Surprisingly, the road team took all three games in this series in 2015. Seattle defeated the 'Caps twice at BC Place, while Vancouver took the only game played at CenturyLink Field thanks to two goals from Pa Modou Kah.