1972 U.S. Professional Indoor – Singles

John Newcombe was the defending champion, but lost in the second round this year. Rod Laver won the title, defeating Ken Rosewall 4–6, 6–2, 6–2, 6–2 in the final.

Source: Wikipedia DBpedia

What is 1972 U.S. Professional Indoor – Singles subject of?

1972 U.S. Professional Indoor – Singles is subject of U.S. Pro Indoor and 1972 Grand Prix (tennis).