Britton gave up five runs and eight hits in five innings. In his only other appearance against the Rangers, the left-hander pitched 7 2-3 scoreless innings in April 2011.
The Orioles closed to 5-4 in their half of the fifth. Two botched grounders preceded a two-out, two-run single by J.J. Hardy.
The Rangers added two runs in seventh. Leonys Martin walked and scored on a double by Jurickson Profar, and A.J. Pierzynski hit an RBI single following an intentional walk to Beltre.