Abstract: A device for practicing tennis strokes that enables a user to develop a correct reflex action and a proper stance while playing tennis, including at least: a supporting structure (1) having a base (1a); an arm (3) having a work trajectory; a torsion member (2) including a subunit (12) for adjusting a force acting on the arm (3) and dynamics of movement of the arm (3); a subunit (6) for adjusting the height of the arm; a subunit (8) for setting a deflection of the work trajectory of the arm; a subunit (9) for adjusting the angle of inclination of the torsion member to the vertical axis (B); and a clamping member (4) for non-invasively clamping a tennis ball (5).