| Date: | July 29 – August 5 |
| Edition: | 44th (men) / 2nd (women) |
| Surface: | Hard / outdoor |
| Location: | Washington, D.C., United States |
| Category: | ATP World Tour 500 (men) WTA International (women) |
| Champms: |  Alexandr Dolgopolov[1] |
| Champws: |  Magdaléna Rybáriková |
| Champmd: | Treat Conrad Huey /  Dominic Inglot |
| Champwd: |  Shuko Aoyama / Chang Kai-chen |
| Main Name: | Washington Open (tennis) Washington Open |
The 2012 Citi Open (known as such for sponsorship reasons) was a tennis tournament played on outdoor hard courts. It was the 44th edition (for the men) and the 2nd edition (for the women) of the event known that year as the Citi Open (previously known on the men's tour as the Legg Mason Tennis Classic), and was part of the ATP World Tour 500 series of the 2012 ATP World Tour, and of the WTA International tournaments of the 2012 WTA Tour. It took place at the William H.G. FitzGerald Tennis Center in Washington, D.C., United States, from July 29 to August 5, 2012, running concurrently with the tennis event at the London Summer Olympics.
The following players were seeded in the main singles draw, following the ATP rankings of July 23, 2012:[2]
| Country | Player | Ranking | Seeds | |
|---|---|---|---|---|
| Mardy Fish | 13 | 1 | ||
| Ukraine | Alexandr Dolgopolov | 17 | 2 | |
| Kevin Anderson | 33 | 3 | ||
| Tommy Haas | 35 | 4 | ||
 Spain | Pablo Andújar | 37 | 5 | |
 France | Jérémy Chardy | 46 | 6 | |
| France | Benoît Paire | 50 | 7 | |
| Sam Querrey | 57 | 8 |
The following players received wild cards into the main singles draw:
The following players received entry from the singles qualifying draw:
| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
 Mexico | Santiago González | Scott Lipsky | 65 | 1 | ||
| Robert Farah | Aisam-ul-Haq Qureshi | 73 | 2 | |||
| Eric Butorac | Paul Hanley | 78 | 3 | |||
 Czech Republic | František Čermák | Julian Knowle | 78 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
David Marrero (finger injury)The following players were seeded in the main singles draw, following the WTA rankings of July 23, 2012:[3]
| Country | Player | Ranking | Seeds | |
|---|---|---|---|---|
| Anastasia Pavlyuchenkova | 28 | 1 | ||
| 42 | 2 | |||
| 52 | 3 | |||
| 56 | 4 | |||
| 60 | 5 | |||
| 61 | 6 | |||
| 70 | 7 | |||
| 81 | 8 |
The following players received wild cards into the main singles draw:
The following players received entry from the singles qualifying draw:
Ayumi Morita (lower back injury)[3] Virginie Razzano (right hip injury)| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
 Belarus | Olga Govortsova |  Russian Federation | Alla Kudryavtseva | 105 | 1 | |
| Karolína Plíšková | Kristýna Plíšková | 193 | 2 | |||
| Lindsay Lee-Waters | Megan Moulton-Levy | 194 | 3 | |||
| Eleni Daniilidou | Karin Knapp | 293 | 4 |
The following pair received wildcard into the doubles main draw:
Simone Kalhorn / Alessondra Parra
Karin Knapp (knee pain)See main article: 2012 Citi Open – Men's singles. Alexandr Dolgopolov defeated Tommy Haas, 6–7(7–9), 6–4, 6–1
See main article: 2012 Citi Open – Women's singles. Magdaléna Rybáriková defeated Anastasia Pavlyuchenkova, 6–1, 6–1
See main article: 2012 Citi Open – Men's doubles. Treat Conrad Huey / Dominic Inglot defeated Kevin Anderson / Sam Querrey, 7–6(9–7), 6–7(9–11), [10–5]
See main article: 2012 Citi Open – Women's doubles. Shuko Aoyama / Chang Kai-chen defeated Irina Falconi / Chanelle Scheepers, 7–5, 6–2
