Philadelphia Union v FC Dallas

(Photo by Ronald Martinez/Getty Images)

Keon Daniel of the Philadelphia Union dribbles the ball against Jackson of FC Dallas at FC Dallas Stadium on May 19, 2012 in Frisco, Texas.

Philadelphia Union v FC Dallas

(Photo by Ronald Martinez/Getty Images)

James Marcelin of FC Dallas dribbles the ball against Brian Carroll of the Philadelphia Union at FC Dallas Stadium on May 19, 2012 in Frisco, Texas.

Philadelphia Union v FC Dallas

(Photo by Ronald Martinez/Getty Images)

Andrew Jacobson of FC Dallas dribbles the ball against Gabriel Gomez of the Philadelphia Union at FC Dallas Stadium on May 19, 2012 in Frisco, Texas.

Philadelphia Union v FC Dallas

(Photo by Ronald Martinez/Getty Images)

James Marcelin of FC Dallas dribbles the ball against Michael Farfan of the Philadelphia Union at FC Dallas Stadium on May 19, 2012 in Frisco, Texas.

Philadelphia Union v FC Dallas

(Photo by Ronald Martinez/Getty Images)

Blas Perez of FC Dallas battles for the header with Sheanon Williams of the Philadelphia Union at FC Dallas Stadium on May 19, 2012 in Frisco, Texas.

Philadelphia Union v FC Dallas

(Photo by Ronald Martinez/Getty Images)

Jackson of FC Dallas battles for the header against Raymon Gaddis of the Philadelphia Union at FC Dallas Stadium on May 19, 2012 in Frisco, Texas.