Classic starter's build, strength through legs, loose and athletic; full-wind, direct to plate from stretch; solid mechanics with distinct phases to delivery from windup; high-three-quarters slot, arm will drag, gets long in back and shows the ball; foot strike on line, easy delivery; 1.33 from stretch.
Sat 94-95 in short outing; easy velocity with wiggle, above-average run, some downhill plane, life; attacks inside against lefties, commands well to the hands; makings of plus-plus raw offering if he can hold it throughout start; dipped to 91 in taxing three-inning outing; will cut off delivery, sail pitch high and arm-side; pitch plays well below velocity at present due to present 40 control; mechanics project to average control and command.
Flashed tilt and bite, tight pitch with late action; tendency to overthrow and spike it at present, got around others; potential out-pitch when thrown properly; highly inconsistent at present with well-below-average control, potential average pitch even if command and consistency never quite gets there.
Wandered between 11-5 and 10-5, shape varied; short horizontal movement with some depth, good ones flashed average; very inconsistent, often spiked, poor present control.
Bolanos is a talented arm with a big fastball, though he had a tough outing in this look. The ease of the delivery, despite some mechanical flaws, projects to work in a starting role. He lacked consistency with any of his secondaries, but both breakers flashed as legitimate offerings on a few occasions. He only threw a couple changeups, one of which flashed fringe-average shape and separation. He has the ceiling of a No. 4 starter, but is far away and needs significant development time to harness his secondaries and develop consistent fastball command.