The film entitled Mr. baseball is centered on the life and activities of Elliot. Elliot is a renowned baseball player who is now getting old for the sports. His team trades him off to a Japanese team. Elliot finds it difficult to accept this and get used to his new life, the new culture and new society. Out of frustration, he becomes very arrogant and gets into trouble with the manager of his new team. Not long after he becomes hostile even to his fellow teammates.
Elliot starts comparing his new team with the former and he stubbornly refuses to adhere to the ways of the team. As a result, his performance in the team is poor. He does not like the captain of the team Uchiyama whom he considers unreasonable. Not long after, he falls in love with Hiroko whom he later finds out is the daughter of Uchiyama.
Elliots gets suspended from the team after causing so much confusion and getting into fights. Uchiyama tells the truth that he regrets hiring Elliot because management objected him doing so but he stubbornly did and now Elliot is failing him. Elliot humbles himself and accepts the fact that he is no longer in the best condition for the game as he used to be in the past. He also admits his faults in the team and apologizes to his teammates for all he has done wrong. He gets readmitted into the team and resumes play. With help from his friends and Uchiyama he starts working hard and learning to be serious. He develops respect for team play and stops being unruly.
Elliot's comeback is highly applauded by his teammates as he starts doing so well in the team of play so much so that this motivates his teammates and the team starts excelling more than ever before. Elliot starts creating new records by breaking old ones such as Uchiyama's record.
At the end, Elliot and Hiroko get married and Elliot starts working as a coach for the Detroit Tigers.