Abstract: The present invention relates to a tennis racquet in which the stringing is at least partially constituted by a single string which passes around rollers disposed in the frame and of which at least one end is fastened to a tensioning device, arranged in the racquet handle, the tensioning device comprising at least one spring connected to the end of the string and an adjusting device for varying the tension imparted by the spring on the string, the adjusting device including a knurled maneuvring knob rotatably mounted at the end of the racquet handle and retained in place by the effort exerted by the spring, the knob and the end of the handle presenting complementary interfitting shapes which prevent rotation.