Diamondbacks’ hitting prospects lock in their approach in minors

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Geraldo Perdomo takes fall Instructional League batting practice, October 9, 2018, at Salt River Fields at Talking Stick. (Photo: Mark Henle/The Republic)

Leading off a game at Salt River Fields last week, Geraldo Perdomo took five fastballs, four of them wide of the strike zone, tossed his bat aside and trotted to first base. In his next trip to the plate, he took another fastball for a ball, then shot a curveball into center field for a single.

Perdomo, the Diamondbacks’ young shortstop prospect, recognizes offspeed stuff well. He has good hand/eye coordination and makes consistent contact. He seems to swing at the right pitches. Most important, he finds his way on base…