1973 U.S. Professional Indoor

The 1973 U.S. Professional Indoor was a men's tennis tournament played on indoor carpet courts at the Spectrum in Philadelphia, Pennsylvania in the United States that was part of the 1973 World Championship Tennis circuit. It was the sixth edition of the tournament and was held from February 6 through February 11, 1973. Third-seeded Stan Smith won the singles title.

Finals

Stan Smith defeated Robert Lutz 7–6, 7–6, 4–6, 6–4

It was Gottfried's 1st title of the year and the 1st of his career. It was Stockton's 1st title of the year and the 1st of his career.

David Gray (February 13, 1973). "No obvious threat yet to United States old guard". The Guardian. p. 27 – via Newspapers.com. The official attendance figure was 60,055, compared with 57,282 last year and 23,074 in 1968.
"1973 Philadelphia – Singles draw". Association of Tennis Professionals (ATP).
"1973 Philadelphia – Doubles draw". Association of Tennis Professionals (ATP).

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