1945 U.S. National Championships (tennis)

The 1945 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York City, United States. The tournament ran from August 28 until September 3. It was the 65th staging of the U.S. National Championships, and due to World War II it was the only Grand Slam tennis event of the year.

Men's singles
🇺🇸 Frank Parker defeated 🇺🇸 William Talbert 14–12, 6–1, 6—2

Women's singles
🇺🇸 Sarah Palfrey Cooke defeated 🇺🇸 Pauline Betz 3–6, 8–6, 6–4

Men's doubles
🇺🇸 Gardnar Mulloy / 🇺🇸 Bill Talbert defeated 🇺🇸 Bob Falkenburg / 🇺🇸 Jack Tuero 12–10, 8–10, 12–10, 6–2

Women's doubles
🇺🇸 Louise Brough / 🇺🇸 Margaret Osborne defeated 🇺🇸 Pauline Betz / 🇺🇸 Doris Hart 6–3, 6–3

Mixed doubles
🇺🇸 Margaret Osborne / 🇺🇸 Bill Talbert defeated 🇺🇸 Doris Hart / 🇺🇸 Bob Falkenburg 6–4, 6–4