File:Mariano Rivera's cutter grip traced onto ball for Roy

A Brilliant Analysis of Mariano Rivera's Pitches

How To Throw a Cutter - Grips, Spin, Hand Action & More

Mariano Rivera - Wikipedia

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What is your opinion on which type of pitches is most effective in baseball? Do you think fastball/curveball/change-up or other types (slider, knuckle ball etc.) are more effective? - Quora

Mariano Rivera's Cutter and the Nastiest Pitches in Baseball, News, Scores, Highlights, Stats, and Rumors

How To Grip / Throw A Cutter - (SICK)

Mariano Rivera Cutter: The Mechanics of His Signature Pitch

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