1974 Commercial Union Assurance Masters Tags: Tennis Tournament, Tournament.The 1974 Commercial Union Assurance Masters) was a men’s tennis tournament played on outdoor grass courts in Melbourne in Australia. It was the 5th edition of the Masters Grand Prix and was held from 10 December through 15 December 1974. champion in single male Guillermo Vilas location Melbourne type of tennis surface Grass / Outdoor Learn more... Loading...