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Not only is Walker's K/BB surprising at 56:16 on the season, but his GB ratio is remaining sky-high - 2.43 according to Hadorn.
That Kevin Brown combo of 10+ strikeouts with groundballs is always an odd one, since batters miss FB's by swinging under them.
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Here's a report on the game you mention, Spec, from MiLB.
Walker is a kid whose stock has gone UP since he was taken as a first-rounder. Same is true of Paxton.