between which two teams was the game played?
Seattle Sounders FC and D.C. United.
2009 U.S. Open Cup Final
The match was won by Seattle Sounders FC, who defeated D.C. United 2–1.
what was the 2009 u.s. open cup final? UNANSWERABLE which type of sport was played? Football.
wiki:24289396
2009 U.S. Open Cup Final [SEP] Introduction
The 2009 Lamar Hunt U.S. Open Cup Final was played on September 2, 2009, at Robert F. Kennedy Memorial Stadium in Washington, D.C. The match determined the winner of the 2009 U.S. Open Cup, a tournament open to amateur and professional soccer teams affiliated with the United States Soccer Federation. This was the 96th edition of the oldest competition in United States soccer. The match was won by Seattle Sounders FC, who defeated D.C. United 2–1. Clyde Simms scored D.C. United's only goal. Fredy Montero and Roger Levesque scored Seattle's two goals as the club became the second expansion team in Major League Soccer (MLS) history to win the tournament in their inaugural season.