PORTLAND TIMBERS (7-15-9; 30 POINTS)AT SOUNDERS FC (13-7-10; 49 POINTS)6 p.m., CenturyLink Field.TV: ESPN. RADIO: 770 AM.CLUB LEADERS: For Portland: G 7, Kris Boyd; A 6, Eric Alexander; S 63, Boyd; SOG 28, Boyd; GAA 2.21, Joseph Bendik. For Seattle: G 13, Eddie Johnson; A 13, Mauro Rosales; S 108, Fredy Montero; SOG 39, Montero; GAA 0.79, Michael Gspurning.HEAD TO HEAD: Seattle leads the all-time series 40-28-10. The MLS series is even, 1-1-2 overall and 0-0-1 at CenturyLink. This season, the Timbers lead 1-0-1, with both games in Portland.NOTES: Portland (2-0-2) clinches the Cascadia Cup with a win or a draw. A Sounders (1-1-3) win would send them into the lead, with one Cup match remaining: Oct. 21, when the Timbers visit Vancouver (0-2-3). Portland is one up on Seattle in the goal-differential tie-breaker. … One of the largest crowds in MLS history is expected: more than 66,000. ... The Timbers are 0-11-4 on the road this season. Seattle is 9-4-1 at home. … Portland is winless over its last five games (0-2-3); Seattle is winless over its last three (0-1-2). … The Timbers are 18th in MLS in goals scored and 17th in goals allowed. … Bright Dike has scored in back-to-back games for Portland. … Gspurning leads MLS in goals-against average and winning percentage (.706). Portland goalkeeper Donovan Ricketts has been out since suffering a shoulder injury in the Sept. 15 game against the Sounders. He is listed as probable for today. … Boyd (adductor) is out. … Seattle midfielder Mario Martinez in unavailable due to duty with the Honduras national team. … Montero and midfielder Osvaldo Alonso are one caution away from yellow-card suspension. … At four locations around the stadium, season-ticket holders and Alliance members can vote on whether to retain general manager Adrian Hanauer. … Former Sounder Roger Levesque will be awarded the Golden Scarf before the match. … The referee is Jair Marrufo.QUOTABLE: “We know they’re not as good on the road as they are at home. … They have a smaller field at home. Obviously, they have tremendous support at home that gives them a big boost. … So, we have to take advantage of the fact that they have not been a good road team and make sure it doesn’t change.”NEXT: Real Salt Lake visits CenturyLink Field at 7 p.m. Oct. 17.