The top six teams from the regular season participated in the double-elimination tournament, the twenty fourth annual tournament sponsored by the Big Ten Conference to determine the league champion.
Ohio State won their seventh tournament championship and earned the Big Ten Conference's automatic bid to the 2005 NCAA Division I baseball tournament.
Michigan claimed the fourth seed over Ohio State by tiebreaker.
As in the previous three years, the top two seeds received a single bye, with the four lower seeds playing opening round games.
Teams that lost in the opening round played an elimination game.