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It generated Leake's second best whiff rate last season at a hair under 11%, and that was before he joined Seattle where it bloomed to a 20% whiff rate (for actual reasons). Here's a pretty neat article from early last season about how the Cutter changed. The 3rd .gif in the article shows one cutter from 2017 in slow motion, and it looks like the pitch attempts to break first right, then sharply left, then slides gently right again as it approaches the plate, which seems to me as something of an ideal inbetween pitch to muddle the pitch decision between Leake's sinker that breaks arm-side and his slider that breaks glove side.