NEW YORK — Huddled around J.B. Shuck’s cell phone in the visitors’ clubhouse at Citi Field, a group of Marlins can’t believe their eyes.



Bewildered, they watch a video from August 2013. Pictured is a man wearing a Jacksonville Suns uniform as he entertains a crowd at the Baseball Grounds of Jacksonville. He starts off slow, tossing three balls in the air. Then four. Then five. Then he moves on to bowling pins. Next, razor-sharp machetes cut through the air. Yes, they’re real. So are the torches he uses for his fiery final act.



“Are you sure it’s him?” a shocked Martín Prado asks.



“How come he’s so bad defensively?” jokes Miguel Rojas.



“You ever seen this?” Shuck asks Justin Bour as he passes by.



The performer in the video is none other than their teammate Derek Dietrich. Now in his sixth big-league season, the Miami utilityman moonlights as an amateur...