Background of TrackMan Introduction and Its Deployment in NPB
TrackMan is a 3D Doppler radar system developed by Denmark's TRACKMAN company, originally designed for golf ball trajectory measurement and later adapted for baseball. In MLB, installation across all ballparks progressed from around 2015, becoming established as the core technology of the Statcast system. In NPB, some teams began independently introducing TrackMan around 2017, and in 2019, the NPB organization decided to install the system in all 12 stadiums. This introduction marked a turning point, bringing objective numerical metrics to Japanese baseball, which had traditionally relied on subjective scouting and player evaluation. Notably, the approximately three-year delay compared to MLB reflected a conflict with Japan's unique coaching culture that emphasized intuition over data. While many veteran coaches showed resistance to quantification, the rise of younger coaches and analytics departments made the trend toward data utilization irreversible.
The Spin Rate Revolution - New Standards for Pitcher Evaluation
The greatest transformation brought by TrackMan's introduction was the ability to quantify pitch quality through spin rate and spin axis. Previously, pitch quality could only be described in subjective terms like 'sharp fastball' or 'forkball with great drop,' but now discussions could reference specific numbers such as a four-seam fastball at 2,400 RPM or a slider with 95% spin efficiency. In NPB, this quantification led to the reevaluation of pitchers with modest velocity but high spin rates. For example, data confirmed that pitchers with average fastball velocities in the low 140 km/h range but spin rates exceeding 2,300 RPM achieved higher whiff rates, influencing draft strategies. However, criticism exists regarding over-reliance on spin rate metrics. In actual games, multiple factors interact beyond spin rate alone, including release point height, extension, and perceived velocity from the batter's perspective.
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Batted Ball Data Utilization and Impact on Shift Strategies
TrackMan measures not only pitches but also exit velocity, launch angle, and distance of batted balls. In NPB, the adoption of defensive shifts utilizing this data accelerated in the 2020s. The strategy of accumulating batted ball direction data for specific hitters and optimizing defensive positioning was already common in MLB, but its introduction in NPB was delayed due to a cultural emphasis on defensive aesthetics. However, the effectiveness demonstrated by data was undeniable. One team's analysis reported that data-driven shifts reduced the batting average against specific hitters by approximately 15%. Batters were also forced to adapt, with increasing numbers working on hitting to the opposite field and consciously adjusting launch angles using TrackMan data. Influenced by the fly ball revolution, batting approaches targeting the barrel zone of 25 to 35 degree launch angles are gradually taking hold in NPB as well.
Challenges of Data Democratization and NPB's Future Vision
The greatest challenge NPB faces in utilizing TrackMan data is data democratization. In MLB, Statcast data is publicly available through Baseball Savant, creating an environment where fans and media can freely conduct analyses. In contrast, NPB's TrackMan data disclosure remains limited, and significant disparities exist between teams in data utilization capabilities. Well-funded teams employ multiple dedicated data analysts and build proprietary analysis systems, while budget-constrained teams can collect data but lack the expertise to analyze and apply it effectively. Going forward, NPB needs to expand data disclosure and address the analytics capability gap between teams. Additionally, the introduction of Hawk-Eye optical tracking systems is being considered, with technology applications expected to expand further into areas such as player motion analysis and umpire decision support. How to integrate data with veteran experiential knowledge holds the key to improving NPB's competitive level.
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