Arguably the mentally toughest player of all time.
Never missed a ball.
Arguably the most solid all around groundstrokes in history.
Amazing tactical brain.
Great drop shots and lobs, both are which are very beneficial on clay, especialy the drop shot.
Was very comfortable moving on clay, and probably moved even better on clay than she did on other courts. Which was opposite many others of her era, especialy with all the grass specialist then. Goolagong, Navratilova, and probably Turnbull were also very comfortable moving and sliding on the clay, but that is about it. Even Mandlikova didn't see as comfortable moving on clay as other courts, although she was still a high quality clay courter. Austin definitely was not