Eleven years after Rivera's retirement, a wrist brace with claws could strip any last intimation of divinity out of pitching. A pitcher's fingers slide into its four rubber rings, attached to metal straws that are fastened by a Velcro strap around the wrist. This device, the FlexPro Grip, measures exactly how quickly each of a pitcher's fingers exert pressure on a ball. But the point of the gadget isn't just to register finger forces. It's to transform the art of pitching into a science.
'I want you to squeeze with your two fingers'-the index and middle-'but only at about 50 percent of your maximum pressure,' Moreau said. 'Hold it there for a few seconds. Hold, hold. And then instantly-boom-ramp up to your max force.' As Dolinsky squeezed, Moreau began peppering him with numbers. 'Get to 69,' he said, glancing at the app in front of them, 'and then when you see that lit...
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