Conversation so far:
What type of playing style did Bobby Riggs have?
Small in stature, he lacked the overall power of his larger competitors such as Don Budge and Kramer but made up for it with brains, ball control, and speed.
Where did Bobby Riggs learn the ball control and speed play style?
Esther Bartosh had encouraged him to play a so-called “girl’s game”, offsetting “his lack of stature with finesse, guile and tactics”.
Did Bobby Riggs have a coach as a child?
He was quickly befriended and then coached by Esther Bartosh, who was the third-ranking woman player in Los Angeles.
Did Bobby Riggs win a lot of matches?
Depending entirely on speed and ball control, he soon began to win boys and then juniors tournaments.

Question: What is an interesting detail about his playing style?
Self-contained rewrite: What is an interesting detail about Bobby Riggs' playing style?