 Complete the following phrase:  The finalists, Columbus Crew SC and Seattle Sounders FC, played each other in the 2010 U.S. Open Cup Final, which was won 21 by Seattle. The two teams had each previously won the MLS Cup, with the Crew defeating the New York Red Bulls in the 2008 final and losing in 2015 to the Portland Timbers. The Sounders were appearing in their fourth MLS Cup final in five years, having played Toronto FC in their three previous finalswinning in 2016 and 