TOKYO—Japan’s professional baseball teams have agreed to introduce a ban on players who return to Japan after opting out of the amateur draft in order to play for overseas pro teams.

The move comes after highly regarded amateur pitcher Junichi Tazawa announced plans last month to negotiate with major league teams rather than make himself eligible for the Oct. 30 draft.

Executives of Japan’s 12 professional teams decided to ban players who had graduated from high school from entering professional Japanese teams for three years after returning to Japan from overseas stint...

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