The 1985 US Open was a tennis tournament played on outdoor hard courts at the USTA National Tennis Center in New York City in New York in the United States. It was the 105th edition of the US Open and was held from August 27 to September 8, 1985.
| 1985 US Open | |
|---|---|
| Date | August 27 – September 8 |
| Edition | 105th |
| Category | Grand Slam (ITF) |
| Surface | Hardcourt |
| Location | New York City, New York, United States |
| Champions | |
| Men's singles | |
 Ivan Lendl | |
| Women's singles | |
| Hana Mandlíková | |
| Men's doubles | |
 Ken Flach / Robert Seguso | |
| Women's doubles | |
 Claudia Kohde-Kilsch / Helena Suková | |
| Mixed doubles | |
Martina Navratilova /  Heinz Günthardt | |
| Boys' singles | |
| Tim Trigueiro | |
| Girls' singles | |
 Laura Garrone | |
| Boys' doubles | |
| Joey Blake / Darren Yates | |
| Girls' doubles | |
| Andrea Holíková / Radka Zrubáková | |
Seniors
editMen's singles
edit Ivan Lendl defeated John McEnroe 7–6(7–1), 6–3, 6–4
- It was Lendl's 2nd career Grand Slam title and his 1st US Open title.
Women's singles
edit Hana Mandlíková defeated Martina Navratilova 7–6(7–3), 1–6, 7–6(7–2)
- It was Mandlíková's 3rd career Grand Slam title and her 1st US Open title.
Men's doubles
edit Ken Flach / Robert Seguso defeated 
Henri Leconte / Yannick Noah 6–7(5–7), 7–6(7–1), 7–6(8–6), 6–0
- It was Flach's 1st career Grand Slam title and his 1st US Open title. It was Seguso's 1st career Grand Slam title and his only US Open title.
Women's doubles
edit Claudia Kohde-Kilsch / Helena Suková defeated Martina Navratilova / Pam Shriver 6–7(5–7), 6–2, 6–3
- It was Kohde-Kilsch's 1st career Grand Slam title and her only US Open title. It was Suková's 1st career Grand Slam title and her 1st US Open title.
Mixed doubles
edit Martina Navratilova / Heinz Günthardt defeated 
Elizabeth Smylie / John Fitzgerald 6–3, 6–4
- It was Navratilova's 35th career Grand Slam title and her 8th US Open title. It was Günthardt's 4th and last career Grand Slam title and his only US Open title.
Juniors
editBoys' singles
edit Tim Trigueiro defeated Joey Blake 6–2, 6–3
Girls' singles
edit Laura Garrone defeated Andrea Holíková 6–2, 7–6
Boys' doubles
edit Joey Blake / Darren Yates defeated Patrick Flynn / David Macpherson 3–6, 6–3, 6–4
Girls' doubles
edit Andrea Holíková / Radka Zrubáková defeated 
Mariana Perez-Roldan / Patricia Tarabini 6–4, 2–6, 7–5