It's not only her ability to hit the ball so hard and so accurately that is astounding, it's the maturity she has to know when to play a point winning shot that seems so incredibly natural. Maturity beyond her years.
Years ago I remember watching TransWorld Sport early one Saturday morning on Channel 4. There was a feature on a young 16 year old Spanish tennis player, who apparently was going to take clay court tennis to a whole new level. His name was Rafa Nadal.