| Champ: |  Ilie Năstase |
| Runner: |  Björn Borg |
| Score: | 6–4, 6–1, 6–2 |
| Type: | singles doubles |
| Draw: | 48 |
| Seeds: | 7 |
| Main Name: | Monte-Carlo Masters |
The 1973 Monte Carlo Open – Singles was an event of the 1973 Monte Carlo Open tennis tournament and was played at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France between 16 April through 21 April 1973. Ilie Năstase was the defending champion and was top-seeded player. He retained his singles title, defeating Björn Borg in the final, 6–4, 6–1, 6–2.[1] [2]