The harder-to-learn topspin stroke has a smaller influence on the first
part of the ball-curve. Like the backspin stroke, however, the axis of spin
remains roughly perpendicular to the trajectory of the ball thus allowing for
the Magnus effect to dictate the subsequent curvature. After the apex of the
curve, the ball clearly dips downwards as it approaches the opposing side,
before bouncing. On the bounce, the topspin will accelerate the ball, much in
the same way that a wheel which is already spinning would accelerate upon
making contact with the ground. Again, the most significant change appears when
the opponent attempts to return the ball (with a smooth, pimples inwards
rubber). Due to the topspin, the ball jumps upwards and the opponent is forced
to compensate for the topspin by adjusting the angle of his or her racket. This
is commonly known as "closing the racket".
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