[STIGLICH: A's Gray rounding into form for regular season]
Oakland's Khris Davis hit a solo home run in the second inning off Griffin, a former A's starter who is returning after sitting out almost two full seasons recovering from major elbow surgery.
Ian Desmond had two hits and Ryan Rua drove in two runs for the Rangers.
A's starter Felix Doubront went four innings and gave up seven runs and seven hits. He walked three and struck out two.