Boston Red Sox infielder Yu Chang could miss six weeks with a hamate fracture in his left hand.
Chang sustained the injury in Monday night's loss in Baltimore, exiting in the middle of an at-bat in the seventh inning. Manager Alex Cora said Tuesday that Chang was expected to see a hand specialist Wednesday in Boston and likely will have surgery Thursday.
The team placed Chang on the 10-day injured list and recalled utilityman Enmanuel Valdez from Triple-A Worcester.
Chang had started 10 of Boston's past 12 games at shortstop while the team used Enrique Hernandez to help shore up positions all over the diamond because of injuries.