Originally Posted by Broly4
It's true, although Borg and Vilas did so with slower swing speeds, and supreme technique.
It's much harder to swing 14 oz.+ wood racquets as fast as the 11 oz. modern racquets of today. Borg and Vilas also generated all that topspin without the use of poly strings and with incredibly dense stringbeds (if you can imagine how dense an 18x20 pattern is in a tiny 65 sq. in. head).