2009 US Open Cup Round 3: Rivalry thrives across league lines; record crowd watches Sounders edge Timbers
Sounders prepare for absolutely massive rivalry match against Portland Timbers
Portland Timbers–Seattle Sounders rivalry - Wikipedia
One ticket gets fans double dose of Seattle-Portland soccer rivalry, Sounders FC
Preview: 'Caps host Next Gen Night against Cascadia rivals Seattle Sounders FC at BC Place, Watch on MLS Season Pass
Seattle Sounders Fall to Timbers - Vanguard
Sounders fall apart late in loss to Timbers
Sounders' Portland rivalry match Sept. 2 - New Day NW
The Portland Timbers in a complete state of disarray against a streaking Seattle Sounders ahead of the Cascadia Derby
PREVIEW, Cascadia Derby in Seattle awaits as Timbers prepare for Sounders
Portland Timbers humiliated by Seattle Sounders in historic 6-2 loss despite Sebastian Blanco's return as starter