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.