Outfielder Fernando Martinez landed on the disabled list with Triple-A Buffalo due to a right hamstring strain. Infielder Luis Hernandez took Martinez's roster spot with the Bisons.
Hernandez cleared waivers at the end of spring training after failing to make the 25-man roster and agreed to remain with the organization. He's expected to primarily play second base with Buffalo.
Martinez, 22, has averaged only 78 games a professional regular season because of assorted injuries.