What Is Pitch Tunneling?
Pitch tunneling is pitch design where different pitch types share identical trajectories from release point to the batter's decision point (approximately 7-8 meters before home plate), then diverge. Batters decide to swing or take in approximately 0.2 seconds, and successful tunneling makes pitch types indistinguishable at decision time. MLB popularized tunneling analysis using tracking data around 2018, revolutionizing pitching coaching. NPB began adopting tunneling concepts around 2022, with SoftBank and DeNA analytics departments applying it to pitch design.
NPB Application Cases
NPB pitchers leveraging tunneling are increasing. Orix's Yoshinobu Yamamoto features near-identical fastball and forkball trajectories, frequently causing misjudgment. Yamamoto's forkball whiff rate exceeds 40%, a classic tunneling effect. Hanshin's Koji Saiki refined cutter-fastball tunneling, dramatically improving his 2023 batting average against. Hiroshima's Masato Morishita adjusted changeup spin axis using tracking data, minimizing trajectory divergence from his fastball until the decision point. In MLB, Yu Darvish is renowned for tunneling mastery, delivering 7-plus pitch types from identical release points.
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Scientific Basis of Tunneling
Tunneling effectiveness exploits human visual cognition limits. Batters' eyes predict final pitch location from initial trajectory through linear extrapolation. When fastballs and forkballs share initial trajectories, the brain predicts fastball and initiates swing, but forkballs drop sharply mid-flight. This prediction-reality gap generates swings and misses. Tracking data quantifies trajectory alignment as tunnel scores. Higher tunnel scores correlate with lower batting averages and slugging percentages against. NPB's expanding stadium-wide tracking system installation continues improving tunneling analysis precision.
Tracking data books offer useful context
Tunneling Limitations and Future
Tunneling is not universal. Extreme velocity differentials (e.g., 150 km/h fastball vs. 110 km/h curve) diminish tunneling effects. Batters are also developing countermeasures, reading pitch type from wrist angle and arm action at release rather than initial trajectory. Rakuten's Hideto Asamura, known for watching the ball's origin point, demonstrates high tunneling resistance. Tunneling and batter countermeasures will continue evolving in an arms race. This intellectual pitcher-batter battle deepens baseball's complexity.