Williams was expected to come onto the active roster for the month of September, but needed to be added to the 40-man. A host of other players that already held 40-man spots are also heading for the big-league dugout: lefty Ty Blach, catcher Austin Wynns, and righties David Hess, Evan Phillips, and Chandler Shepherd.
Once a well-regarded Yankees prospect, the 28-year-old Williams got his first extended chance at the majors last year with the Reds. He produced at close to the league-average rate offensively but was outrighted at season’s end. Williams has spent the entire season to this point with the Orioles’ top affiliate, slashing .308/.371/.477 with 18 home runs in 494 plate appearances.
As for Peterson, he has struggled since the O’s summoned him to help fill out the position-player mix. The six-year MLB veteran carries a .220/.269/.330 batting line in 108 trips to the plate on the season.