Eloy Jimenez, White Sox

The 23-year-old Jimenez had a stellar rookie season in which he finished fourth in AL Rookie of the Year voting. While the walk-to-strikeout ratio can stand to improve (30-to-134), he crushed 31 home runs and finished with an .828 OPS. The third-ranked prospect according to Major League Baseball entering 2019 also needs to show improvement on defense after a subpar year in left field.