It was the 67th edition of the event and was part of the 1975 Commercial Union Assurance Grand Prix circuit .
The 1975 Grand Prix German Open was a combined men 's and women 's tennis tournament played on outdoor red clay courts .
Grand Prix German Open was the 67th Grand Prix German Open of the event and was part of the 1975 Commercial Union Assurance Grand Prix circuit .
The 1975 Grand Prix German Open was a combined men 's and women 's tennis tournament played on outdoor red clay courts .