Portland Timbers–Seattle Sounders rivalry
| Other names | Cascadia Cup |
|---|---|
| Location | Pacific Northwest |
| First meeting | May 2, 1975 NASL Portland 0–1 Seattle |
| Latest meeting | May 17, 2025 MLS regular season Portland 1–1 Seattle |
| Next meeting | October 4, 2025 MLS regular season Seattle v Portland |
| Statistics | |
| Meetings total | 142 |
| Most wins | Seattle (66) |
| All-time series | 66–57–19 (Seattle) |
| Largest victory | Portland 1–6 Seattle WACS (July 3, 1985) |
| Largest goal scoring | Portland 2–6 Seattle MLS regular season (August 15, 2021) |
| Postseason history | |
| |
The Portland Timbers–Seattle Sounders rivalry is a soccer rivalry between the Portland Timbers and Seattle Sounders FC, both based in the Pacific Northwest region of the United States. The rivalry originated in the North American Soccer League of the 1970s, with both cities reviving expansion teams, and has carried into lower-level leagues, including the A-League and USL First Division. The rivalry moved to Major League Soccer, the top division of soccer in the United States, in 2011, where it has grown into one of the largest in American soccer.
According to many players, the Seattle–Portland rivalry is one of the only true derbies that is present in American men's soccer. The rivalry has since grown into one of the largest and most bitter rivalries in American soccer. Alan Hinton, a former English international and ex-Sounders coach, has compared the rivalry to those seen in the English Premier League. It is considered to be one of the most intense rivalries in the United States. In 2018, Matt Pentz of ESPN FC dubbed the derby "MLS' premier rivalry", stating that the "series' longevity lends it an authenticity that no other rivalry in MLS can match."
Seattle and Portland have had rivalries based on various sports teams. A heated rivalry surrounded the Portland Buckaroos and Seattle Totems of the minor-league Western Hockey League in the 1960s. Later, some fans supported the Thunderbirds or Winterhawks hockey teams. This rivalry "naturally translated into soccer" according to one fan. The two cities also had a rivalry between the SuperSonics and Trail Blazers of the NBA, known as the I-5 Rivalry, since both cities are connected by Interstate 5.