| 1971 Philadelphia International Indoor Open Championships | |
|---|---|
| Date | February 9–14 |
| Edition | 4th |
| Category | World Championship Tennis (men) Virginia Slims Circuit (women) |
| Draw | 32S (men) 16S (women) |
| Prize money | $50,000 (men) $12,500 (women) |
| Surface | Carpet / indoor |
| Location | Philadelphia, Pennsylvania, United States |
| Venue | Spectrum |
| Attendance | 50,199 |
| Champions | |
| Men's singles | |
 John Newcombe[1] | |
| Women's singles | |
 Rosie Casals | |
The 1971 Philadelphia International Indoor Open Championships[2] also called the Philadelphia International Indoor[3] was a WCT and Virginia Slims Circuit tennis tournament played on indoor carpet courts. It was played at the Spectrum in Philadelphia, Pennsylvania in the United States. It was the fourth edition of the tournament and was held from February 9 through February 14, 1971. John Newcombe and Rosie Casals won the singles titles.[4][5][6]
- ^ "1971 Philadelphia – Men's singles draw". Association of Tennis Professionals (ATP).
- ^ Amur, Neil Amur (February 11, 1971). "Rosewall Is Upset by Davidson in First Round of Philadelphia Open Tennis". The New York Times. New York City: The New York Times Company. p. 62. Retrieved October 8, 2023.
- ^ Tingay, Lance (1971). "US Tournaments". In Barrett, John (ed.). World Tennis' 71 A BP YEARBOOK. London: The Queen Anne Press Ltd. p. 145. ISBN 0362000913.
- ^ John Dolan (2011). Women's Tennis 1968–84: the Ultimate Guide. Remous. pp. 81, 85.
- ^ John Barrett, ed. (1972). World of Tennis '72. London: Queen Anne Press. pp. 134–135. ISBN 9780362001037. OCLC 86035663.
- ^ "Laver beaten". The Sydney Morning Herald. February 16, 1971. p. 22 – via Google News Archive.