The Keio University Baseball Club won the 2019 Fall Tokyo Big6 Baseball League, claiming the title for the 37th time. They last claimed the title in the 2018 spring tournament.
In the first game against Waseda University played on November 2 (Sat.), the Baseball Club won 7-1 to come first in the tournament with 9 consecutive wins. A win on the 3rd (Sun.) would have meant winning all 10 games of the tournament for the first time in 91 years, but Waseda scored 3 runs in the first inning, making it a difficult game. Keio's attempt to close the gap throughout the game was in vain, ultimately losing 4-6. An exciting game was played on the 4th (Mon.) in which both teams contended over a single point. Waseda scored a run in the final inning to win 3-4, ending Keio's run to end the tournament with a win over each of the opposition universities for a complete set of victories in the tournament. However, the captain of the Keio University Baseball Club, Yuya Gunji (Faculty of Environment and Information Studies; catcher) won the triple crown. The last Keio player to win the triple crown was Yoshinobu Takahashi at the 1996 spring tournament. Additionally, 5 members of the Baseball Club were selected in the best nine, a glorious achievement for the club.
After the closing ceremony, a parade from the Jingu Stadium to Mita Campus was held followed by a victory celebration at the campus. About 750 people took part in the parade and around 2,000 people, including Keio students, alumni, and those from the neighboring areas, participated in the victory celebrations and shared in the joy of winning the tournament.