Philadelphia Union defender Keegan Rosenberry (left) goes up for the ball with Seattle Sounders forward Nelson Valdez (right) during the second half at CenturyLink Field. Seattle won 2-1.

Seattle Sounders FC forward Obafemi Martins (9) celebrates his goal against the New England Revolution during the first half at CenturyLink Field.

Haiti defender Romain Genevois (5) cuts off Peru forward Edison Flores (20) during the second half of the group play stage of the 2016 Copa America Centenario at Century Link Field. Peru won 1-0.

Seattle's Mauro Rosales (far left) celebrates the Sounders second goal while New England's goalkeeper lays on the ground in the first half.

Seatlte goalkeeper Michael Gspurning (in yellow) comes up to aid on a header in stoppage time with teammate Sammy Ochoa (26) and San Jose's Sam Cronin (4).

Seattle Sounders forward Joevin Jones (33) gets a head on the ball in front of New York City FC defender R.J. Allen (27) during the first half at CenturyLink Field.

New York Red Bulls midfielder Sacha Kljestan (center) and midfielder Lloyd Sam (right) go up for a header with Seattle Sounders FC midfielder Andy Rose (5) during the second half at CenturyLink Field. Seattle won 2-1.

Toronto FC defender Clement Simonin (38) clears the ball as Seattle Sounders FC midfielder Lamar Neagle (27) tries to get there during the first half at CenturyLink Field.

Portland Timbers defender Norberto Paparatto (23) clears a cross away from Seattle Sounders FC midfielder Lamar Neagle (27) during the first half at Starfire Sports Complex.

Sporting Kansas City midfielder Gerso Fernandes (12) undercuts Seattle Sounders FC defender Brad Smith (11) on a header during the first half at CenturyLink Field.

The Seattle Sounders celebrate in the locker room after beating Toronto FC in the MLS Cup at CenturyLink Field.

Portland's Jeremy Hall (left) and Seattle's Alvaro Fernanez go up for a header in the first half.

Seattle Sounders midfielder Lamar Neagle, left, celebrates his first half goal against the Vancouver Whitecaps during a CONCACAF Champions League soccer match, Wednesday, Sept. 23, 2015, in Seattle.

Seattle Sounders forward Will Bruin (17) leaps up for the ball against the New England Revolution during the second half at CenturyLink Field.

Real Salt Lake midfielder John Stertzer (27) wins a header against Seattle Sounders FC forward Clint Dempsey (2) during the first half at CenturyLink Field.

Seattle Sounders FC goalkeeper Stefan Frei (24) warms up before a game against the Toronto FC at CenturyLink Field.

Los Angeles Galaxy forward Gyasi Zardes (11) jumps for the ball with Seattle Sounders FC midfielder Osvaldo Alonso (6) during the second half at CenturyLink Field. Seattle tied Los Angeles 1-1.

Real Salt Lake goalkeeper Nick Rimando (behind) slides into celebrate with teammate Robbie Russell after Russell's penalty kick sealed the win for Salt Lake.

Real Salt Lake midfielder Kyle Beckerman (5) takes out Seattle Sounders FC forward Clint Dempsey (2) during the first half at CenturyLink Field.

Seattle Sounders FC midfielder Nicolas Lodeiro (10) claps after a game against the Colorado Rapids in the first leg of the MLS Western Conference Championship at CenturyLink Field.

(From left) Real Salt Lake defender Marcelo Silva (30), Seattle Sounders FC defender Kelvin Leerdam (18), midfielder Jordan Morris (13) and defender Aaron Herrera (22) go for a header on a corner kick during the second half at CenturyLink Field.

Seattle Sounders midfielder Victor Rodriguez (8) celebrates with the MLS Cup after beating Toronto FC during the MLS Cup at CenturyLink Field.