| Singles | |
|---|---|
| 1973 U.S. Professional Indoor | |
| Champion |  Stan Smith |
| Runner-up | Robert Lutz |
| Score | 7–6(7–2), 7–6(7–5), 4–6, 6–4 |
| Draw | 32 |
| Seeds | 12 |
Rod Laver was the defending champion, but lost in the quarterfinals this year.
Stan Smith won the title, defeating Robert Lutz 7–6(7–2), 7–6(7–5), 4–6, 6–4 in the final.
Rod Laver (quarterfinals) Colin Dibley (quarterfinals) Stan Smith (champion) Dick Stockton (quarterfinals) John Alexander (first round) Roy Emerson (second round) Robert Lutz (final) Cliff Richey (quarterfinals) Allan Stone (first round) Phil Dent (second round) Harold Solomon (second round) Tom Edlefsen (first round)| Semifinals | Final | ||||||||||||||||
 Nikola Pilić | 4 | 4 | 7 | 3 | |||||||||||||
| 7 | Robert Lutz | 6 | 6 | 5 | 6 | ||||||||||||
| 7 | Robert Lutz | 62 | 65 | 6 | 4 | ||||||||||||
| 3 | Stan Smith | 77 | 77 | 4 | 6 | ||||||||||||
| 3 | Stan Smith | 6 | 6 | 6 | |||||||||||||
 Robert Maud | 1 | 3 | 4 | ||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||||
| 2 | C Dibley | 6 | 3 | 6 | |||||||||||||||||||||||||
| T Addison | 3 | 6 | 3 | 2 | C Dibley | 66 | 6 | 6 | |||||||||||||||||||||
| F McMillan | w/o | F McMillan | 78 | 1 | 1 | ||||||||||||||||||||||||
| C Drysdale | 2 | C Dibley | 77 | 2 | 61 | ||||||||||||||||||||||||
| 6 | R Emerson | 6 | 6 | N Pilić | 62 | 6 | 77 | ||||||||||||||||||||||
 JE Mandarino | 4 | 0 | 6 | R Emerson | 63 | 66 | |||||||||||||||||||||||
| B Phillips-Moore | 1 | 3 | N Pilić | 77 | 78 | ||||||||||||||||||||||||
| N Pilić | 6 | 6 | N Pilić | 4 | 4 | 7 | 3 | ||||||||||||||||||||||
| 4 | D Stockton | 77 | 6 | 7 | R Lutz | 6 | 6 | 5 | 6 | ||||||||||||||||||||
 G Battrick | 63 | 4 | 4 | D Stockton | 6 | 6 | |||||||||||||||||||||||
 M Holeček | 5 | 4 | 11 | H Solomon | 3 | 2 | |||||||||||||||||||||||
| 11 | H Solomon | 7 | 6 | 4 | D Stockton | 6 | 63 | 2 | |||||||||||||||||||||
| 7 | R Lutz | 77 | 6 | 7 | R Lutz | 4 | 77 | 6 | |||||||||||||||||||||
| B Gottfried | 62 | 3 | 7 | R Lutz | 6 | 4 | 6 | ||||||||||||||||||||||
 O Parun | 6 | 1 | 78 | O Parun | 4 | 6 | 4 | ||||||||||||||||||||||
| 9 | A Stone | 3 | 6 | 66 | |||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||||
| 12 | T Edlefsen | 61 | 7 | 68 | |||||||||||||||||||||||||
 J Fillol | 77 | 5 | 710 | J Fillol | 6 | 65 | 4 | ||||||||||||||||||||||
| P Cornejo | 4 | 0 | 8 | C Richey | 3 | 77 | 6 | ||||||||||||||||||||||
| 8 | C Richey | 6 | 6 | 8 | C Richey | 0 | 3 | ||||||||||||||||||||||
| 10 | P Dent | 77 | 6 | 3 | S Smith | 6 | 6 | ||||||||||||||||||||||
| J McManus | 63 | 3 | 10 | P Dent | 3 | 3 | |||||||||||||||||||||||
| R Barth | 2 | 4 | 3 | S Smith | 6 | 6 | |||||||||||||||||||||||
| 3 | S Smith | 6 | 6 | 3 | S Smith | 6 | 6 | 6 | |||||||||||||||||||||
| A Pattison | w/o | R Maud | 1 | 3 | 4 | ||||||||||||||||||||||||
| B Hewitt | A Pattison | 2 | 3 | ||||||||||||||||||||||||||
| R Maud | 77 | 4 | 6 | R Maud | 6 | 6 | |||||||||||||||||||||||
| 5 | J Alexander | 64 | 6 | 1 | R Maud | 6 | 4 | 78 | |||||||||||||||||||||
| C Pasarell | 77 | 6 | 1 | R Laver | 4 | 6 | 66 | ||||||||||||||||||||||
| F Froehling | 62 | 2 | C Pasarell | 7 | 4 | 3 | |||||||||||||||||||||||
 ON Bengtson | 5 | 1 | 1 | R Laver | 5 | 6 | 6 | ||||||||||||||||||||||
| 1 | R Laver | 7 | 6 | ||||||||||||||||||||||||||
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