Mild sink, moderate run, some life and mild deception, can get under barrels, will elevate it to the hands; flashes true plus, generates in-zone whiffs; fringe-average control with below-average present command projection
Softer and rounder in-zone, will steal early strikes with it, confidence to double- and triple-up; right-handers have shown propensity to pick it up better; late vertical action, sweeps it out of the zone ahead; above-average tilt, will flash plus projection with tight two-plane bite, can get there with greater consistency
Cuban IFA signed for six years and $30 million. Sierra's frame is on the small size for a right-hander and pretty well maxed out physically at 24. The arm action is loose and clean, though he shows poor synch between his upper and lower halves at present. His drive has an awful lot of drift, leading to inconsistencies in his timing and poor present command. The fastball-slider combination flashes above-average potential, with the slider showing elements of a plus pitch, and an additional tick of velocity could be possible in a short relief role. He lacks consistency over multiple innings in a starting role, and has struggled with poor mound presence and failure response in multiple outings. He's thrown a whopping two hard changeups with split-like action across the three starts I've seen, and the lack of that third pitch's game utility at present limits projection to that of a straight middle relief profile if the command sharpens into at least fringe-average range.