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This week on the 90th Percentile, Geoff and Matt welcome on Rylan Domingues of Tread Athletics to discuss his recent Twitter thread on "Why pitch grades matter... until they don\'t." We discuss the thread in greater detail, Rylan\'s work at Tread and get a better understanding of horizontal approach angle and the concept of a "bridge" pitch. We have a highly-informative episode this week from one of the top training groups in baseball.