Vancouver Whitecaps' Erik Hurtado (L) vies with Portland Timbers' Rodney Wallace during a MLS soccer game in Vancouver, Canada, on May 18, 2013. The match ended with a 2-2 tie. (Xinhua/Sergei Bachlakov)

Portland Timbers' Kalif Alhassan (top) vies with Vancouver Whitecaps' Russell Teibert during a MLS soccer game in Vancouver, Canada, on May 18, 2013. The match ended with a 2-2 tie. (Xinhua/Sergei Bachlakov)

Vancouver Whitecaps' Brad Rusin (L) vies for the ball during a MLS soccer game against Portland Timbers in Vancouver, Canada, on May 18, 2013. The match ended with a 2-2 tie. (Xinhua/Sergei Bachlakov)

Vancouver Whitecaps' Andy O'Brian heads a ball during a MLS soccer game against Portland Timbers in Vancouver, Canada, on May 18, 2013. The match ended with a 2-2 tie. (Xinhua/Sergei Bachlakov)

Vancouver Whitecaps' Jordan Harvey (L) vies with Portland Timbers' Darlington Nagbe during a MLS soccer game in Vancouver, Canada, on May 18, 2013. The match ended with a 2-2 tie. (Xinhua/Sergei Bachlakov)