Sidespin is the shot tennis mostly forgot

Everything in the modern game is measured on the topspin axis, which leaves a whole dimension of ball behaviour undertrained.

We talk about spin as if it were a single quantity that goes up and down. More topspin, less topspin, backspin on the slice. Almost nothing in the conversation acknowledges that a ball can rotate around a vertical axis as well, curving in flight and kicking sideways off the bounce, and that this axis is barely coached outside the serve.

On the serve it is universal. Every slice serve out wide is sidespin and every player understands it. Off the ground it has almost vanished, and I think that is a habit rather than a physical fact. A forehand hit with the racket travelling across the ball from the inside produces a shot that bends away from a right handed opponent's backhand and drags them off the court further than the landing point suggests. It is a genuinely awkward ball to hit and it is unusual enough that most players have no rehearsed answer.

The reason it fell out of use is the modern grip and swing path, which are optimised for a vertical brush and produce a clean topspin shot with enormous consistency. Adding a lateral component costs some of that consistency and a bit of pace. In a sport where the coaching orthodoxy is built on repeatability, that trade looks bad on paper.

It looks better in a specific situation, which is the wide ball on the run. From out beyond the doubles alley, a curving cross court forehand with side rotation stays in play from angles that a pure topspin drive cannot, because the curve brings it back. One or two players build entire defensive games on this and it gets described as improvisation. It is not improvisation. It is a technique nobody else bothered to learn.

The doubles game keeps it alive at the net, where a sidespin drop volley that bounces away from the court is still standard, and where nobody would consider it exotic.

Singles players could steal it back tomorrow.

Most of them are too busy adding another two hundred revolutions to a shot that already works.