Wherever David Peterson roamed, familiarity followed. As Peterson emerged from the Mets’ clubhouse Saturday afternoon, Steven Matz, a fellow left-handed pitcher, walked over to greet him. Moments later it was Jacob deGrom, who shares an agency with the Mets’ 2017 first-round Draft pick. Then Michael Conforto, a former Oregon State Beaver, offered some good-natured ribbing for the Oregon Duck.

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