Umpire Critically Injured by Bat... Japanese Baseball Introduces Immediate Ejection for "Dangerous Swings"

Penalty Applies to All First and Second League Games Starting May 12

Ejection for Striking Others or Bat Flying Into Stands

Japanese professional baseball has introduced a “dangerous swing” penalty to prevent safety accidents caused by bats slipping out of the batter’s hands. This measure follows a recent incident in which a batter’s bat struck the umpire’s head during a game, resulting in the umpire requiring emergency surgery.

According to Nippon Professional Baseball (NPB) on May 12, NPB has implemented penalty regulations for “dangerous swings” in all official games of both the first and second leagues starting from this day. On the previous day, NPB and the 12 Japanese professional baseball clubs held an executive committee meeting and agreed to define acts in which a batter loses or throws the bat during a swing—thereby threatening others—as dangerous swings.

NPB defines a dangerous swing as a situation where the batter cannot maintain a grip on the bat throughout the swing and either throws or loses control of the bat. In particular, the penalty will be applied if the entire bat is directed toward others—such as players, umpires, coaches, ball boys, or bat boys—since this poses a significant risk of harm. The dugout, camera area, and spectator stands are also included as part of the danger zone.

The penalty varies depending on the situation. If a dangerous swing occurs but the bat does not hit anyone, a warning is issued. If the same batter commits a second dangerous swing in the same game, they are ejected. If the entire bat flies toward someone and strikes them directly, or if it enters a dead-ball area such as the dugout, camera area, or spectator stands, the batter is immediately ejected. However, attempts to bunt are excluded from the scope of this regulation.

This measure was introduced following a recent accident in Japanese professional baseball. On April 16, during a game between the Yakult Swallows and the Yokohama DeNA BayStars at Tokyo’s Meiji Jingu Stadium, a bat slipped from Jose Osuna’s hands and struck umpire Takuto Kawakami, who was acting as the home plate umpire. Kawakami was immediately transported to a hospital and underwent emergency surgery.

According to Japanese media, Kawakami was transferred from the intensive care unit to a general ward, but he has not yet regained consciousness. After the incident, there have been growing calls within the Japanese baseball community to strengthen safety measures for umpires, players, and game officials. In response, NPB announced the day after the accident that it “considers this a very serious matter” and would review measures to ensure the safety of umpires.

It is considered unusual for new penalty regulations to be introduced in the middle of a season. The proposal was discussed at the rules committee meeting on April 23, one week after the incident, and was officially approved unanimously by all 12 clubs at the executive committee meeting on May 11.

NPB emphasized that losing or throwing the bat, regardless of intent, constitutes a serious lack of consideration for safety. The league added that, to raise batters’ awareness of safety, the umpiring crew must strictly enforce the new regulations.