Why the Red Sox are teaching their catchers to catch with one knee down - The Athletic
Red Sox swap catchers, cutting Swihart and calling up León
How will the Red Sox approach their catching situation this offseason? - The Boston Globe
Does One-Knee Catching Actually Lead To More Wild Pitches? — College Baseball, MLB Draft, Prospects - Baseball America
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How the knee-down revolution changed catching - without downgrading defense
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Baseball Catcher Drills One knee down/blocking and batting
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