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“Loft creates backspin, Colin, which negates sidespin.”

The GCQuad’s four ultra-high-speed cameras process 20 times the amount of data the original GC2 did and measure every conceivable swing and shot element from impact location to sidespin, all in a unit the height of a decent pyramid of range balls and easily carried in a backpack.

That can affect contact and also put left-to-right sidespin on the ball, so it doesn’t roll true.

Both balls are designed to reduce sidespin for straighter tee shots.

There was a twelve- or thirteen- or fifteen-shot rally—I couldn’t keep track fast enough—that ended with de Minaur rushing the net and Nadal, on a dead run to his left past the corner of the baseline, hitting a forehand with such perfect sidespin that it passed de Minaur in the air not only out of reach but outside of fair territory, only to curve back in before it landed deep in the court: winner.