The 1990 US Open was a tennis tournament played on outdoor hard courts at the USTA National Tennis Center in New York City in the United States. It was the 110th edition of the US Open and was held from August 27 to September 9, 1990.
Pete Sampras defeated Andre Agassi 6–4, 6–3, 6–2
- It was Pete Sampras' 1st career Grand Slam title and his 1st US Open title. He became the youngest US Open men's singles champion at 19 years, 28 days.
Gabriela Sabatini defeated Steffi Graf 6–2, 7–6(7–4)
- It was Sabatini's only Grand Slam title. She became the first female tennis player from Argentina to win a Grand Slam singles title.
Pieter Aldrich / Danie Visser defeated Paul Annacone / David Wheaton 6–2, 7–6 (7–3), 6–2
- It was Pieter Aldrich's 2nd and last career Grand Slam title and his only US Open title. It was Danie Visser's 2nd career Grand Slam title and his only US Open title.
Gigi Fernández / Martina Navratilova defeated Jana Novotná / Helena Suková 6–2, 6–4
- It was Gigi Fernández's 2nd career Grand Slam title and her 2nd US Open title. It was Martina Navratilova's 55th career Grand Slam title and her 15th US Open title.
Elizabeth Smylie / Todd Woodbridge defeated Natasha Zvereva / Jim Pugh 6–4, 6–2
- It was Elizabeth Smylie's 3rd career Grand Slam title and her 2nd and last US Open title. It was Todd Woodbridge's 1st career Grand Slam title and his 1st US Open title.
Andrea Gaudenzi defeated Mikael Tillström 6–2, 4–6, 7–6
Magdalena Maleeva defeated Noëlle van Lottum 7–5, 6–2
Marten Renström / Mikael Tillström defeated Sébastien Leblanc / Greg Rusedski 6–7, 6–3, 6–4
Kristin Godridge / Kirrily Sharpe defeated Erika de Lone / Lisa Raymond 4–6, 7–5, 6–2
Gentlemen's Invitation Singles
Sandy Mayer defeated Tom Gullikson 6–4, 6–4
Gentlemen's Invitation Doubles
Tom Gullikson / Dick Stockton defeated Mark Edmondson / Sherwood Stewart 6–7, 7–6, 6–4
Ladies' Invitation Doubles
Rosemary Casals / Billie Jean King defeated Wendy Turnbull / Virginia Wade 2–6, 6–4, 6–3
Total prize money for the event was $6,349,250.