Japan's Koshien tournament weighs switch to 7-inning games amid record heat

Japan's Koshien tournament, the storied symbol of high school baseball, is stirring controversy after the sport's governing body began considering cutting games from nine innings to seven in response to record-breaking heat. The proposed change is aimed at protecting young athletes, but coaches and players are pushing back, warning it would rob the game of its late-inning drama and reduce playing time for bench players.

According to the Tokyo Shimbun on Monday, the Japan High School Baseball Federation is weighing the introduction of a seven-inning format starting with the National High School Baseball Championship in August 2028. The idea is to shorten the time players spend exposed to intense summer heat by trimming two innings from the standard nine-inning game.

The national high school baseball tournament is held twice a year — in March and August — at Koshien Stadium in Hyogo Prefecture. The summer edition, which this year marks its 108th running, is one of Japan's most-watched sporting events, broadcast live nationwide and steeped in decades of tradition.

Repeated bouts of record heat driven by climate change have raised growing concerns about the health of both players and spectators. Because the tournament is held during the summer school break, shifting it to a cooler season is not straightforward given the impact on students' academic schedules.

An expert panel convened by the federation submitted a report last December recommending adoption of a seven-inning format from 2028. At this year's August tournament, organizers tried a split-session schedule — holding games in the morning and afternoon to avoid the midday heat — but 16 players still showed suspected symptoms of heat illness during the event. Those cases accelerated discussions about the format change once the tournament ended.

Within the high school baseball community, voices warning against tampering with the game's core appeal are growing louder. Aoyagi Hirofumi, baseball coach at Gendai Takasai High School and runner-up at this year's tournament, said the sport's magic lies in what happens after the seventh inning. "High school baseball has its drama after the seventh inning," he said. "That's where you find the joy of digging deep and holding on."

Sakamaki Nobuyuki, director of Takushoku Goryo High School, also criticized the proposal. "Baseball changes its momentum every three innings — a seven-inning format would destroy that flow," he said, adding that fewer innings would also mean fewer opportunities for players to see the field.

Some in the sport argue that expanding substitution rules would be a better way to ease the physical burden on players without shortening games. A former high school baseball coach said concentration, not just stamina, becomes critical in the later innings. "Increasing the number of bench players would reduce the burden on individuals," he said.

The Tokyo Shimbun noted that many people on the ground want the nine-inning format preserved, saying a move to seven innings would alter the very foundation of high school baseball. The Japan High School Baseball Federation now finds itself caught between the need to protect player safety and the resistance of a baseball community determined to guard a long-held tradition.