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
- It was Năstase's 24th title of the year and the 58th of his career.
- ^ Collins, Bud (October 2010). "Year-End Championships". The Bud Collins History of Tennis: An Authoritative Encyclopedia and Record Book. New York: New Chapter Press. p. 746. ISBN 978-0-942257-70-0.