Japanese professional baseball has introduced a new in-season rule to penalize batters who lose control of their bats during swings, following a shocking incident where an umpire was struck in the head and remains unconscious. The rule, announced by Nippon Professional Baseball (NPB) on May 11, targets “dangerous swings” where a batter fails to hold onto the bat and releases it during the motion.
Under the new regulation, if a bat is thrown and does not hit anyone, the batter will receive a warning. However, a second offense by the same player in the same game results in an immediate ejection. If the bat strikes another person—including players, umpires, coaches, ball boys, or bat boys—in a situation where they cannot avoid it, or if it flies into the dugout, camera area, or stands, the batter is automatically ejected without warning.
The rule change comes just over a month after umpire Takuto Kawakami was critically injured during a game between the Yakult Swallows and DeNA BayStars on April 16. Kawakami was struck directly on the temple by a bat that slipped from the hands of Yakult’s Jose Osuna during the eighth inning. The umpire underwent emergency surgery but has not regained consciousness. In a statement on April 30, NPB confirmed that Kawakami remains in a coma and expressed gratitude for the support from fans, wishing for his swift recovery.
Osuna was involved in another incident on April 26, when his backswing hit the opposing catcher’s head. Meanwhile, on May 10, Chunichi’s Takuya Kinoshita struck Yomiuri catcher Takumi Oshiro’s head with his bat, causing the game to be halted. These recurring accidents prompted NPB to mandate helmets for home plate umpires starting May 18, alongside the new penalties for dangerous swings.
Some experts, however, have raised concerns about potential negative effects. Professor Tomohisa Miyazai of Sendai University, a motion analysis specialist, told Mainichi Shimbun that batters might become hesitant to swing fully, reducing power hitting and diminishing the game’s value. He argued that requiring protective equipment for on-field personnel would be a more practical solution than penalizing batters.
The NPB’s rules committee will continue to monitor the situation and may adjust the penalties as needed to balance safety and the integrity of the game.
