Cross: Spin is governed by the tangential coefficient of restitution, typically about 0.2 for a tennis ball on tennis strings. The maximum possible value is 1.0 and that could double the spin.

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The speed of his racket put the ball on a trajectory to the back fence, but his high-tech copolyester strings bent it down inside Soderling’s own service line for an untouchable winner.

How tennis players create spin is about as complicated a physics question you can set about solving without invoking subatomic particles.