Futures
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Corniell signed out of the Dominican Republic with the Mariners for $630,000, the fifth-largest bonus given to a right-handed pitcher during the 2019-20 international signing period. The Rangers acquired him and infield prospect Andres Mesa in exchange for Rafael Montero in December 2020, and Corniell did't make his pandemic-delayed pro debut until six months later. After a rough introduction to full-season ball in 2022, he improved his arsenal and control, breezed through two Class A levels last summer at age 20 and earned organization Minor League Pitcher of the Year accolades. Corniell throws three different fastballs: a four-seamer that sits at 92-95 mph and touches 97 with armside run and carry, a low-90s two-seamer to get ground balls and an upper-80s cutter he added in 2023 to combat left-handers. His best pitch is an 82-85 mph slider with two-plane depth that earns plus grades at its best. He's also making progress with a low-80s changeup that tumbles when it's on. With a drop-and-drive delivery, Corniell creates extension and a flat approach angle. Some scouts think he has more of a reliever arm action, though he does have plenty of arm speed and a strong 6-foot-3 frame that should lend itself to durability. If he can continue to refine his cutter and changeup to improve his success against lefties, he could be a No. 4 starter.

 
Affiliates
Round Rock Express (AAA)
Round Rock, TX | Pacific Coast League
Website | Roster | Schedule
Frisco Roughriders (AA)
Frisco, TX | Texas League
Website | Roster | Schedule
Hickory Crawdads (Hi A)
Hickory, NC | South Atlantic League
Website | Roster | Schedule
Down East Wood Ducks (Lo A)
Kinston, NC | Carolina League
Website | Roster | Schedule