I seem to remember the term being used all the time when Harold Soloman played. That did not ever seem like tennis to me but he won a lot.
Right. I first heard it applied to Soloman. Probably though, it was around before that. I think Andrea Jaeger also used the moonball a lot.
Amazing to me that people thought it was an original MTF term.
Of course, MTF may be original in misuing the term to apply to ordinary topspin.