On a September Monday in Nashville, Thomas Pannone — a 32-year-old left-hander who has spent years wandering baseball's margins — retired all 27 batters he faced, throwing the first perfect game in Minor League Baseball since 2017 and only the fifth in the International League's 142-year history. It was an act of rare precision: 94 pitches, eight strikeouts, no walks, no blemishes. In a sport that measures men by their persistence as much as their talent, Pannone's perfection arrived not in the flush of youth but after years of quiet, stubborn refusal to quit.