I'm not that worried about Mitch Keller's recent struggles. At least not in the sense of his long-term upside.

Keller gave up three runs and walked five batters in four innings on April 28th. He rebounded in his next start with a good outing, but struggled again in his last start, leaving after 4.1 innings with four earned runs, three walks, and one strikeout. He's had some control issues this year, leading to 17 walks in 34 innings, which were amplified by those two starts. Control typically isn't his problem, and wasn't an issue for him last year in Altoona.

Typically with prospects, I try to ignore the short-term bumps in the road. They happened with guys like Gerrit Cole, Jameson Taillon, and every other pitching prospect. If a problem goes on for an extended period of time, we s...

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