The Düsseldorf Open was a women's clay court tennis tournament founded as a combined men's and women's tournament in 1905 called the Düsseldorf International or Internationale Düsseldorf.^[1] It remained a joint event until 1969 and was held annually at the Rochusclub Düsseldorfer Tennisclub in Düsseldorf, Germany until 1974.^[1]

In 1898 the Rochusclub Düsseldorfer Tennisclub was founded.^[2] In 1905 the club staged the first Internationale Düsseldorf tournament.^[1] In 1906 a womens event was added to the schedule. In 1929 the Rochusclub moved to a new location where it remains today.^[3] It was held annually in Düsseldorf, Germany until 1974.^[1] The combined event was part of the Deutscher Lawn Tennis Bund (f.1902) circuit from inception until 1913.^[1] In 1914 it became part of the new ILTF Circuit until 1969.^[1] In 1970 the men's event was re branded as the Düsseldorf Grand Prix and became part of the Grand Prix tennis circuit.^[1] The women's event remained a part of the ILTF Circuit under the original name Dusseldorf International. In 1973 the women's event was branded as the Düsseldorf Open and was part of the 1973 WTA Tour for one edition only, before it returned as an event on the ILTF Independent Tour. The women's event ended in 1974 and the men's tournament was discontinued in 1977.^[1]

The Düsseldorf Open was a women's professional tennis tournament held for one year, in 1973, in Düsseldorf, West Germany. Its one-year on the WTA Tour saw a home player, Helga Masthoff, winning in the women's singles, whilst she and Heide Orth reached a women's doubles final that was not played.

(incomplete roll)

Düsseldorf International
Year	Winners	Runners-up	Score
1906	Lucie Bergmann	Elspeth Holzapfel	6–1, 6–4
1908	Dagmar von Krohn	M. Holzapfel	6–1, 6–0
1912	Anita Heimann Lent	Maria Deus	6–3, 6–0
1928	Cilly Aussem	Elizabeth Ryan	7–5, 6–4
1929	Hilde Krahwinkel	Irma Kallmeyer	6–4, 6–1
1935	Marie Luise Horn	Nelly Adamson	1–6, 6–4, 6–1
1937	Anneliese Ullstein	Hella Kovac	6–1, 6–3
1938	Gracyn Wheeler	Rosl Kraus	6–3, 2–6, 7–5
1939	Hilda Walterová	Alice Florian	6–1, 6–3
1952	Thelma Coyne Long	Joan Curry	6–0, 6–1
1950	Mary Terán de Weiss	Inge Pohmann	6-2, 8-6
1955	Doris Hart	Erika Vollmer	6-2, 6-1
1956	Shirley Fry	Heather Nicholls Brewer	6-1, 13-11
1959	Karol Fageros	Renate Ostermann	6-8, 6-1, 6-1
1960	Maria Bueno	Edda Buding	6-1, 6-1
1961	Lesley Turner	Renate Ostermann	6-3, 6-2
1962	Lesley Turner (2)	Jan Lehane	6-1, 6-2
1963	Margaret Smith	Lesley Turner	6-3, 6-2
1964	Margaret Smith (2)	Lesley Turner	1-6, 6-1, 6-4
↓  Open era  ↓
1969	Helga Niessen	Edda Buding	6–1, 8–6
1970	Helga Hosl	Helga Niessen	7–5, 6–4
1971	Helga Masthoff (2)	Betty Stöve	4–6, 6–3, 6–3
1972	Pat Walkden Pretorius	Katja Ebbinghaus	6–2, 1–6, 6–3
↓  WTA Tour  ↓
1973	Helga Masthoff (3)	Evonne Goolagong	6–4, 6–4
↓  ILTF Independent Tour  ↓
1974	Katja Ebbinghaus	Helga Masthoff	6–2, 6–1
1975	Helga Masthoff (4)	Evonne Goolagong	6–4, 6–4

Year	Champions	Score
1973	Evonne Goolagong / Janet Young vs. Helga Masthoff / Heide Orth	Divided (not competed)

• Düsseldorf Grand Prix
• ATP Düsseldorf Open

• WTA Tour history