Conversation so far:
Whose playing style are we talking about in this story?
Stefanie Maria Steffi Graf is a German former professional tennis player.
What is the first name of Steffi Graf?
Steffi Graf's full name is Stefanie Maria Steffi Graf.
What was something about Steffi Graf's playing style that really stuck out?
Graf's technique on the forehand was unique and recognizable: generating considerable racquet head speed with her swing, she reached the point of contact late and typically out of the air.
Did Steffi Graf style on the forehand do good for her and help her win?
As a result, Steffi Graf hit her forehand with exceptional pace and accuracy.
Did Steffi Graf ever get hurt using her style on the forehand?
What was something else Steffi Graf did besides her style on the forehand?
Steffi Graf had a powerful backhand drive but over the course of her career tended to use it less frequently, opting more often for an effective backhand slice.
Did Steffi Graf's powerful backhand drive playing style win her any awards?
Graf remains the only player to have won the calendar-year Grand Slam on three surfaces or to have won each Grand Slam at least four times with her style.
Did Steffi Graf use her forehand and backhand playing style to win proceeds for charities?
What else is interesting with Steffi Graf' unique playing style?
Steffi Graf built her powerful and accurate serve up to 174 km/h, making it one of the fastest serves in women's tennis and was a capable volleyer.

Question: when did she stop touring and playing all together
Self-contained rewrite: When did Steffi Graf stop touring and playing professional tennis?