BALTIMORE -- Rangers rookie Ronald Guzman belted his first career grand slam in Sunday's series finale at Camden Yards to give the visitors an early 4-0 lead.
It was the 23-year-old's ninth career big league homer, in his 70th game.
Orioles spot starter Miguel Castro walked the Rangers' first three batters before striking out Rougned Odor. Then Guzman turned on Castro's 1-1 sinker, sending an arcing blast over the grounds crew shed in right field.
Manny Machado's homer in the bottom of the inning pulled Baltimore back to within 4-1.