The 1973 Commercial Union Assurance Masters) was a tennis tournament played on indoor carpet courts in Boston, Massachusetts in the United States. It was the 4th edition of the Masters Grand Prix and was held from December 4 through December 8, 1973.
Ilie Năstase defeated Tom Okker 6–3, 7–5, 4–6, 6–3
ATP Tour World Championships
Tennis Masters Cup
ATP World Tour Finals