Since 1995 the number of pitchers who saw big league action at age 19 or 20 has not been large. We average no more than 3 such rookies each year. What this means, in part, is less that Rick Porcello is in ‘elite’ company as it does that Rick Porcello is hard to find comparables for. We understand the progression of pitchers in normal circumstances a bit better, …
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