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Yaisel Sierra

Born: 06/05/1991 (Age: 24)
Bats: Right Throws: Right
Height: 6' 1" Weight: 170
Mechanics
Slender frame, wiry strength, athletic movements, minimal remaining projection; low-effort delivery, semi-wind, moderate leg kick; mild stab, clean to high-three-quarters; slows tempo, mild drop, stays uphill, stride drifts offline; hips over-rotate, drag to release, flies open, frequent arm-side misses, inconsistent finish; timing issues exacerbated in stretch, inconsistent takeaway; quick to the plate, 1.16-1.25; fought his catcher in first start, poor mound presence in multiple outings, struggles to respond to adversity
Evaluator Wilson Karaman
Report Date 05/22/2016
Affiliate Rancho Cucamonga Quakes (High A, Dodgers)
Dates Seen 4/30, 5/10, 5/20/16
OFP 45
Realistic 40/Middle Reliever
MLB ETA 2017
Video Yes
Pitch Type Present Grade Future Grade Sitting Velocity Peak Velocity Report
FB 50 55 91-93 94 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
SL 50 60 81-84 85 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
Overall

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.

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