There has never been a unanimous selection to the Baseball HOF. Weirdly, Ken Griffey Jr. came the closest - 99.32%. Then, Tom Seaver - 98.84%. Babe Ruth, Ty Cobb, If you look at some of the percentages, it makes you wonder what the baseball writers were on when they voted: https://www.baseball-reference.com/bullpen/Hall_of_Fame_Voting_Percentages