1973 U.S. Professional Indoor – Singles

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.

1973 U.S. Professional Indoor – Singles

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.