sentences:  All unprotected major and minor League players were eligible except those chosen in the amateur drafts of 1991 or 1992 and players who were 18 or younger when signed in 1990.The Marlins and Colorado Rockies, set to debut in 1993, were allowed to participate in all rounds of the June 1992 MLB first-year player draft.The Marlins selected 28th overall in the first round, with catcher Charles Johnson their top (and most successful) pick.