1981 U.S. Pro Indoor – Singles

Jimmy Connors was the defending champion, but lost in the quarterfinals this year. Roscoe Tanner won the title, defeating Wojtek Fibak, 6–2, 7–6, 7–5 in the final.

Source: Wikipedia DBpedia

What is 1981 U.S. Pro Indoor – Singles subject of?

1981 U.S. Pro Indoor – Singles is subject of U.S. Pro Indoor and 1981 Grand Prix (tennis).