From the Super Mario Wiki, the Mario encyclopedia
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The Typhoon Save is a Defensive Power Shot that Clay and Ace can use in Mario Tennis: Power Tour. L4 Jump and L2 Spin is required to obtain this save, and it is already used by the optional opponent Elroy in the story mode. Once activated, the user spins, generating a typhoon out of leaves and flies with the typhoon to the ball to make a weak return to the opposing side.
"A spinning save that creates a tornado to return the ball with."