One thing we preach a lot about here on the SweetSpot blog is a hitter's ability to take walks. Two reasons this is important: One is the practical analysis that it helps your on-base percentage, which helps your team's offensive production; but a better approach can also make a player a better hitter (see how Mark Trumbo's improved patience has helped him this year). Which gets us to Cubs shortstop Starlin Castro.

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