The D-backs added a prospect to their farm system on Wednesday night, trading veteran outfielder Michael Bourn to the Orioles in exchange for Minor League outfielder Jason Heinrich.
Heinrich was a fifth-round pick by Baltimore in the 2015 Draft. The 20-year-old spent last season in the rookie-level Gulf Coast League, then advanced to short-season Class A Aberdeen this year, where he batted .231/.301/.347 with eight doubles, three home runs and 13 RBIs over 44 games.
Bourn signed a Minor League contract with Arizona on May 10 after he was released by both the Braves and Blue Jays earlier in the year. The 33-year-old appeared in 89 games for the D-backs, batting .261/.307/.362 and stealing 13 bases in 18 attempts.

With Bourn gone, Arizona now has an open spot on its 40-man roster.