Philadelphia Union v Seattle Sounders

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Goalkeeper Zac MacMath of the Philadelphia Union takes a shin to the head by David Estrada of of the Seattle Sounders at CenturyLink Field on May 5, 2012 in Seattle.

Philadelphia Union v Seattle Sounders

(Photo by Otto Greule Jr/Getty Images)

Gabriel Gómez (R) of the Philadelphia Union battles Andy Rose of the Seattle Sounders at CenturyLink Field on May 5, 2012 in Seattle.

Philadelphia Union v Seattle Sounders

(Photo by Otto Greule Jr/Getty Images)

Fredy Montero of the Seattle Sounders controls the ball against Freddy Adu of the Philadelphia Union at CenturyLink Field on May 5, 2012 in Seattle.

Philadelphia Union v Seattle Sounders

(Photo by Otto Greule Jr/Getty Images)

Mauro Rosales of the Seattle Sounders celebrates with teammates after scoring a goal against the Philadelphia Union at CenturyLink Field on May 5, 2012 in Seattle.

Philadelphia Union v Seattle Sounders

(Photo by Otto Greule Jr/Getty Images)

Josuà Martínez of the Philadelphia Union battles Patrick Ianni of the Seattle Sounders at CenturyLink Field on May 5, 2012 in Seattle.

Philadelphia Union v Seattle Sounders

(Photo by Otto Greule Jr/Getty Images)

Danny Califf of the Philadelphia Union heads the ball against Eddie Johnson of the Seattle Sounders at CenturyLink Field on May 5, 2012 in Seattle.

Philadelphia Union v Seattle Sounders

(Photo by Otto Greule Jr/Getty Images)

Keon Daniel of the Philadelphia Union battles David Estrada of the Seattle Sounders at CenturyLink Field on May 5, 2012 in Seattle.

Philadelphia Union v Seattle Sounders

(Photo by Otto Greule Jr/Getty Images)

Fredy Montero of the Seattle Sounders battles Sheanon Williams of the Philadelphia Union at CenturyLink Field on May 5, 2012 in Seattle.