What Is the Defensive Shift
A defensive shift repositions infielders or outfielders far from their standard locations based on a batter's batted-ball tendencies. The classic example is the overshift against pull-heavy left-handed hitters, placing three infielders to the right of second base. In MLB, shifts surged in the late 2010s: by 2022 roughly 34 percent of all plate appearances featured a shift, up from about 10 percent in 2016. In NPB, shift usage began spreading around 2020 among clubs with dedicated analytics departments, reaching approximately 12 percent of plate appearances in the 2023 season. The SoftBank Hawks and DeNA BayStars in particular use proprietary tracking systems comparable to Statcast, deploying precise shifts based on each batter's spray-chart distribution.
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MLB Shift-Ban Rules and Their Effects
MLB banned defensive shifts starting with the 2023 season. The rule requires all four infielders to be positioned on the infield dirt at the time of the pitch, with two on each side of second base; violations result in an automatic ball. The regulation lifted the 2023 league-wide batting average to .248, a 15-point jump from .233 the year before. BABIP also improved from .296 to .300, with left-handed hitters showing the most pronounced gains. However, the shift ban coincided with larger bases (aimed at boosting stolen bases) and the pitch clock, making it difficult to isolate the ban's individual contribution. Average game time fell to 2 hours 40 minutes, 24 minutes shorter than the prior year, though this is attributed mainly to the pitch clock.
The Debate Within NPB
NPB's Rules Committee reviewed a report on MLB's shift-ban effects at its January 2024 meeting. The report noted that because NPB's shift usage is lower than MLB's (roughly 12 percent vs. 34 percent), the batting-average boost from a ban would be limited, an estimated 5 to 8 points. Proponents argue the ban would restore traditional baseball strategy and make games more exciting through more hits. Opponents counter that tactical diversity through data analytics is a hallmark of modern baseball and that regulation unfairly restricts clubs' strategic freedom. Former Chunichi Dragons manager Hiromitsu Ochiai weighed in, stating that it is the batter's job to develop the skill to beat the shift and that banning it by rule puts the cart before the horse.
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Future Outlook
NPB has deferred immediate adoption for the 2025 season, opting instead to explore trial implementation in minor-league games. The specific plan calls for applying MLB-equivalent rules in the second half of the Eastern League season (July onward) and collecting data on batting averages and game flow. On the technical side, real-time monitoring of fielder positions via tracking cameras is under discussion, potentially leveraging the Hawk-Eye systems already installed at five stadiums. Internationally, the shift ban may be applied at the 2026 WBC, giving NPB an additional incentive to align with global rules. A final decision is expected to be carried over to the Owners' Meeting in autumn 2025.