1959 U.S. National Championships (tennis)

The 1959 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on outdoor grass courts at two locations in the United States. The men's and women's singles as well as the mixed doubles were played from September 4 through September 13 at the West Side Tennis Club, Forest Hills in New York City, while the men's and women's doubles were held at the Longwood Cricket Club in Chestnut Hill, Massachusetts from August 16 though August 23, 1959. It was the 79th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of the year. Neale Fraser and Maria Bueno won the singles titles.

Men's singles
🇦🇺 Neale Fraser (AUS) defeated 🇺🇸 Alex Olmedo (USA) 6–3, 5–7, 6–2, 6–4

Women's singles
🇧🇷 Maria Bueno (BRA) defeated Christine Truman (UK) 6–1, 6–4

Men's doubles
🇦🇺 Neale Fraser (AUS) / 🇦🇺 Roy Emerson (AUS) defeated 🇺🇸 Alex Olmedo (USA) / 🇺🇸 Earl Buchholz (USA) 3–6, 6–3, 5–7, 6–4, 7–5

Women's doubles
🇺🇸 Jeanne Arth (USA) / 🇺🇸 Darlene Hard (USA) defeated 🇧🇷 Maria Bueno (BRA) / 🇺🇸 Sally Moore (USA) 6–2, 6–3

Mixed doubles
🇺🇸 Margaret Osborne duPont (USA) / 🇦🇺 Neale Fraser (AUS) defeated 🇺🇸 Janet Hopps (USA) / 🇦🇺 Bob Mark (AUS) 7–5, 13–15, 6–2