Munoz is the highest ranked of the group, at No. 13. The 22-year-old hit .240 with nine home runs and 39 RBIs in 102 games for Double-A Midland last season.
The 25-year-old Brugman is rated the team's No. 25 prospect. The left-handed hitter batted .285 with 12 home runs and 87 RBIs in 132 games split between Double-A and Triple-A last year.
Blackburn is the A's No.