Originally Posted by Dan Lobb
I have just consulted the official USPTA historical site, and it still says that the US Pro was not held between 1952 and 1961.
The US Pro was held at Cleveland from 1952 to 1962. The draw started to weaken around 1958 with Sedgman and Rosewall staying away, got weaker and smaller in 1960, and crashed in 1962. The 1962 US Pro had very few top players, with only Buchholz, Arkinstall, Segura and MacKay taking part. This tournament is the recognised US Pro, even though it regularly went under the title of "World Professional Championships".