Since Castellanos had been designated for assignment on Oct. 17 (to make room for Mike Baxter), Hazelbaker does not immediately join the Dodgers’ 40-man roster.
Hazelbaker, 26, spent the entire 2013 season with Triple-A Pawtucket, batting .257/.313/.374 with 11 home runs and 54 RBI in 121 games. He was fifth in the International League with 37 steals.
The Muncie, Indiana, native has a .258/.338/.421 with 194 steals, 60 home runs and 247 RBI in 530 games in five professional seasons since being selected by Boston in the fourth round of the 2009 draft out of Ball State University — the alma mater of former Dodger Larry Bigbie.
The Red Sox designated Pedro Beato for assignment to make room for Castellanos on their 40-man roster.