1973 Commercial Union Assurance Masters – Singles

Two-time defending champion Ilie Năstase successfully defended his title, defeating Tom Okker in the final, 6–3, 7–5, 4–6, 6–3 to win the singles title at the 1973 Commercial Union Assurance Masters.

Blue group
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.''

White group
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.''