Data from PSA reveals that half of the top 20 most-collected ... Ohtani's 2018 Bowman rookie card / PSA Among both active and retired baseball players PSA has graded cards of most, Ohtani is ...

No one could argue that Ken Griffey Jr. is one of the most collected baseball players in the hobby, even 15 years after he last stepped up to a MLB plate. Currently, his PSA graded cards sit at ...