Arizona League scouts were so taken with the potential of Lopez that a stray cat frequenting one of the league's facilities was named "Frank Lopez" in honor of one of their favorite pitching prospects. Pitching the entire year at age 17 (he won't turn 18 until next April), Lopez showed the inconsistency expected for his age but also flashed effortless arm speed. Lopez has a hard 88-94 mph fastball with good life, late run and sink. It projects as a future plus pitch, and he has feel for a slider and changeup. Lopez should have plus command in time, with his high walk totals coming more from being too fine with his pitches.
Padres manager Vinny Lopez was impressed with the strides that Lopez made in his conditioning during the summer. "He gained some man muscle," manager Lopez said, "and that really helped with his delivery and helped him being able to sustain his strength."
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