| 1973 Commercial Union Assurance Masters | |
|---|---|
| Date | December 4 - December 8 |
| Edition | 4th |
| Category | Masters Grand Prix |
| Surface | Carpet / indoor |
| Location | Boston, USA |
| Champions | |
| Singles | |
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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