From the Super Mario Wiki
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The Control Shot is an Offensive Power Shot that Clay and Ace can use in Mario Tennis: Power Tour. It requires L1 Balance to be unlocked and is used by Tori in the story mode. When activated, the user spins towards the ball and smacks it into the opposing side of the court. Returners of this shot will suffer light amounts of knockback.
"A commanding shot that sends the ball right into the corner."