1973 U.S. Professional Indoor
| 1973 U.S. Professional Indoor | |
|---|---|
| Date | February 6 – February 11 |
| Edition | 6th |
| Category | World Championship Tennis |
| Draw | 32S / 16D |
| Prize money | $50,000 |
| Surface | Carpet / Indoor |
| Location | Philadelphia, PA, United States |
| Venue | Wachovia Spectrum |
| Champions | |
| Singles | |
 Stan Smith
|
|
| Doubles | |
|
Brian Gottfried / |
|
The 1973 U.S. Professional Indoor was a WCT tennis tournament played on indoor carpet courts at the Wachovia Spectrum in Philadelphia, Pennsylvania in the United States. It was the sixth edition of the tournament and was held from February 6 through February 11, 1973.
Stan Smith defeated Robert Lutz 7–6(7–2), 7–6(7–5), 4–6, 6–4
Brian Gottfried / defeated 
Roy Emerson / Rod Laver 4–6, 6–3, 6–4
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