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.

Seniors

Men's singles

Ivan Lendl defeated 🇺🇸 John McEnroe 7–6(7–1), 6–3, 6–4

Women's singles

Hana Mandlíková defeated 🇺🇸 Martina Navratilova 7–6(7–3), 1–6, 7–6(7–2)

Men's doubles

🇺🇸 Ken Flach / 🇺🇸 Robert Seguso defeated 🇫🇷 Henri Leconte / 🇫🇷 Yannick Noah 6–7(5–7), 7–6(7–1), 7–6(8–6), 6–0

Women's doubles

Claudia Kohde-Kilsch / Helena Suková defeated 🇺🇸 Martina Navratilova / 🇺🇸 Pam Shriver 6–7(5–7), 6–2, 6–3

Mixed doubles

🇺🇸 Martina Navratilova / Heinz Günthardt defeated 🇦🇺 Elizabeth Smylie / 🇦🇺 John Fitzgerald 6–3, 6–4

Juniors

Boys' singles

🇺🇸 Tim Trigueiro defeated 🇺🇸 Joey Blake 6–2, 6–3

Girls' singles

🇮🇹 Laura Garrone defeated Andrea Holíková 6–2, 7–6

Boys' doubles

🇺🇸 Joey Blake / 🇺🇸 Darren Yates defeated 🇦🇺 Patrick Flynn / 🇦🇺 David Macpherson 3–6, 6–3, 6–4

Girls' doubles

Andrea Holíková / Radka Zrubáková defeated 🇦🇷 Mariana Perez-Roldan / 🇦🇷 Patricia Tarabini 6–4, 2–6, 7–5