Question: What 1970 American born tennis player won the 1990 ATP Tour World Championships – Singles?
Sentence (from "1997 ATP Tour World Championships"): The 1997 ATP Tour World Championships (also known for the doubles event as the "Phoenix ATP Tour World Doubles Championship" for sponsorship reasons) were tennis tournaments played on indoor hard courts for the singles event, and indoor carpet courts for the doubles event.
Relevant evidence: No