At top tennis tournaments, stealthy ‘ballers’ keep the gears turning

Kuangkai Tai waits. As the tennis pros bat and grunt back and forth, he stretches underneath the bleachers. A light squat, some lunges — anything to keep the 54-year-old limber and ready to perform. “Advantage, set point,” the umpire calls. The crowd hushes. Tai jumps, eagerly trotting toward the g...

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