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We introduce a new spin metric for fastballs to better isolate a pitcher's ability to generate spin. Slides 1&2: Baseball Spin and Pitchers' Performance (Kanosue, Nagami, Higuchi, Maekawa, and Yanai, 2014) Middle Finger and Ball Movements Around Ball Release During Baseball Fastball Pitching (Matsuo et al, 2017) Factors Determining Spin Axis of a Pitched Fastball in Baseball (Jinji, Sakurai, Hirano, 2011) Characteristics of ball spin by baseball pitchers in the period of development (Jinji, Sakurai, Shimizu, Suzuki, 2008) Direction of Spin Axis and Spin Rate of Pitched Ball (Jinji, Sakurai, 2006) All Slides: Determining the 3D Spin Axis from TrackMan Data (Nathan, 2007- Updated 2015) Data Courtesy of Baseball Savant
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