Dating back to 1914, the Lamar Hunt U.S. Open Cup is the oldest cup competition in United States soccer and is among the oldest in the world. Open to all affiliated amateur and professional teams in the United States, the annual U.S. Open Cup is a single-elimination tournament. The Dynamo won their first-ever Open Cup championship in 2018.
The U.S. Open Cup is very similar to the domestic cup competitions popular in Europe, South America and the rest of the world. Cup competitions, which usually run concurrent with a country's league sason, are open in the early stages to any club that can qualify, giving local amateur teams a chance to compete against the best teams a country has to offer.
MLS teams have taken part in the competition and dominated it since 1996, making the tournament a true "national" championship. In fact, the only non-MLS team to win the title since 1996 were the Rochester Raging Rhinos in 1999, with former Dynamo goalkeeper Pat Onstad in net.
Beginning in 2014, all domestic MLS clubs directly entered the competition in the fourth round.
| 2006 | ||
| Opponent | Result | Round |
|---|---|---|
| vs. Carolina Dynamo (PDL) | W 4-2 | Fourth Round |
| vs. FC Dallas | W 3-0 | Quarterfinals |
| at LA Galaxy | L 3-1 | Semifinals |
| 2007 | ||
| Opponent | Result | Round |
| at Charleston Battery (USL1) | L 1-0 AET | Third Round |
| 2008 | ||
| Opponent | Result | Round |
| at Charleston Battery (USL1) | T 1-1 (Lost 4-3 on PKs) | Third Round |
| 2009 | ||
| Opponent | Result | Round |
| at Austin Aztex (USL1) | W 2-0 | Third Round |
| vs. Charleston Battery (USL1) | W 4-0 | Quarterfinals |
| at Seattle Sounders FC | L 2-1 AET | Semifinals |
| 2010 | ||
| Opponent | Result | Round |
| vs. Miami FC (USSF D2) | W 1-0 | Third Round |
| vs. Chivas USA | L 2-1 | Fourth Round |
| 2011 | ||
| Opponent | Result | Round |
| vs. Sporting KC (College Station, TX) | L 1-0 AET | Qualification |
| 2012 | ||
| Opponent | Result | Round |
| at San Antonio Scorpions (NASL) | L 1-0 | Third Round |
| 2013 | ||
| Opponent | Result | Round |
| vs. FC Tucson (PDL) | W 2-0 | Third Round |
| at FC Dallas | L 3-0 | Fourth Round |
| 2014 | ||
| Opponent | Result | Round |
| vs. Laredo Heat (PDL) | W 2-0 | Third Round |
| vs. FC Dallas | L 3-2 AET | Fourth Round |
| 2015 | ||
| Opponent | Result | Round |
| vs. Austin Aztex (USL) | W 2-0 | Fourth Round |
| vs. Colorado Rapids | W 1-0 | Fifth Round |
| at Sporting KC | L 3-1 | Quarterfinals |
| 2016 | ||
| Opponent | Result | Round |
| vs. San Antonio FC (USL) | W 4-0 | Fourth Round |
| vs. Sporting Kansas City | W 3-1 | Fifth Round |
| vs. FC Dallas | L 0-1 | Quarterfinals |
| 2017 | ||
| Opponent | Result | Round |
| at North Carolina FC (NASL) | W 3-2 AET | Fourth Round |
| vs. Sporting Kansas City | L 0-2 | Fifth Round |
| 2018 | ||
| Opponent | Result | Round |
| vs. NTX Rayados (Texas) | W 5-0 | Fourth Round |
| vs. Minnesota United FC | W 1-0 | Fifth Round |
| vs. Sporting Kansas City | W 4-2 | Quarterfinal |
| vs. Los Angeles Football Club | T 3-3 (Won 7-6 on PKs) | Semifinal |
| vs. Philadelphia Union | W 3-0 | Final |
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