The 2013 Lamar Hunt U.S. Open Cup Final was the 100th edition of the Lamar Hunt U.S. Open Cup, the oldest ongoing competition in American soccer. The match featured Major League Soccer (MLS) teams D.C. United and Real Salt Lake. It was played on October 1, 2013, at Rio Tinto Stadium in Sandy, Utah, a southern suburb of Salt Lake City. It was the first Open Cup final to be held in the state of Utah. The final score was D.C. United 1, Real Salt Lake 0. This was D.C. United's third title.

It was the first final since 2008 not to feature the Seattle Sounders. It was Salt Lake's first trip to the Open Cup final, and marked their first time in a final of any competition since the 2011 CONCACAF Champions League Finals. It was D.C. United's fifth, and their first time in the final of a major North American sporting competition since 2009, when they lost the 2009 Open Cup final to Seattle.

D.C. United, the winner of the match, earned a $250,000 cash prize, as well as a berth into the 2014–15 CONCACAF Champions League. Real Salt Lake, the runner-up, received a $60,000 cash prize. D.C. United had a 5-0 record in the tournament, despite posting a 3-24-7 record in MLS play.

The U.S. Open Cup is an annual American soccer competition open to all United States Soccer Federation affiliated teams, from amateur adult club teams to the professional clubs of MLS. The 2013 tournament was the centennial edition of the oldest soccer tournament in the United States.

For the second consecutive season, all American-based MLS teams earned automatic qualification into the third round tournament proper. Previously, only eight teams from MLS could qualify for the tournament, six automatically based on the previous year's league results, and two more via a play-in tournament.

Prior to 2013, D.C. United had won the U.S. Open Cup 2 times, in 1996 and 2008. They had played in 4 finals of the competition, with the last appearance being in 2009 when they lost 2–1 to Seattle Sounders FC.

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