TAMPA, Fla.--Nestor Cortes got behind the plate in a batting cage and watched an 8-foot-high, 1,200-pound robot spit out fastballs, cutters and sweepers just like the ones spinning off the fingertips ...

The Trajekt Arc machine lets batters practice against a replication of any pitcher they will face, firing pitches with specific spin and even incorporating video of the windup and delivery. Video ...