After overhauling his delivery last season, DeSclafani spent this offseason fine-tuning that more efficient delivery, with a specific emphasis on his curveball, Bobby Nightengale of The Cincinnati Enquirer reports.

The curveball is the key to improving DeSclafani's performance against left-handers. Last season, the hurler allowed a .795 OPS to left-handers as opposed to a .638 OPS against right-handers. That's actually a considerable improvement over 2018, when lefties had a .917 OPS against him, and that improvement can largely be chalked up to his curveball.

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