1976 Commercial Union Assurance Masters Tags: Tennis Tournament, Tournament.The 1976 Commercial Union Assurance Masters was a tennis tournament played on indoor carpet courts at The Summit in Houston in the United States. It was the 7th edition of the Masters Grand Prix and was held from December 7 through December 12 1976. champion in double male Fred McNair, Sherwood Stewart champion in single male Manuel Orantes Learn more... Loading...