"Ka" is an extremely powerful shot that can be hit as a smash, forehand, or backhand. When Sanada uses this shot, his opponents are overwhelmed by his power. When Sanada uses "Ka" as a smash, his stance suggests that it's the move Cyclone Smash is based on. Rikkaidai's Kirihara Akaya was totally defeated when Sanada used this shot when Kirihara challenged him during Sanada's 2nd year. The power of this shot is enough to break through the Tezuka Zone if used consecutively.