1973 USLTA Indoor Circuit
The 1973 USLTA Indoor Circuit was a professional tennis circuit held in the United States from January until March that year. It consisted of 13 tournaments and was organized by Bill Riordan and sanctioned by the United States Lawn Tennis Association.
Schedule
January
February
March
| Week of | Tournament | Champion | Runner-up | Semifinalists | Quarterfinalists |
| 5 Mar | Paramus, New Jersey, U.S. Hard – 16S/8D |  Jimmy Connors 6–1, 6–2 | Clark Graebner |  Juan Gisbert, Sr.  Ilie Năstase | Sandy Mayer Ion Țiriac Vitas Gerulaitis Steve Siegel |
| 5 Mar | Garcia Classic San Juan, Puerto Rico, U.S. |  Alex Metreveli 6–4, 6–4, 0–6, 7–5 |  Roger Taylor | ||
| 19 Mar | Equity Funding Championship Washington D.C., U.S. Carpet – 32S | Ilie Năstase 4–6, 6–2, 7–5, 6–2 | Jimmy Connors |  Jürgen Fassbender Karl Meiler |  Nicholas Kalogeropoulos  Ian Fletcher Billy Martin Paul Gerken |
| 19 Mar | Mississippi Indoors Jackson, Mississippi, U.S. Hard – 16S/D16 | Eddie Dibbs 5–7, 6–1, 7–5 |  Frew McMillan | Sherwood Stewart Raz Reid | Zan Guerry  Jaime Pinto-Bravo Charles Owens Clark Graebner |
Prize money standings
| Rk | Name | Prize money |
| 1 | $37,700 | |
| 2 | $20,125 | |
| 3 | $15,250 | |
| 4 | $12,150 | |
| 5 | $10,375 | |
| 6 | $9,525 | |
| 7 | $9,425 | |
| 8 | $8,975 | |
| 9 | $6,300 | |
| 10 | $6.050 |