Jarrod Parker (7-6) yielded two runs on six hits and two walks through six innings, striking out six for American League West-leading Oakland, which snapped the Rangers' five-game winning streak.
Sean Doolittle and Ryan Cook each pitched a scoreless inning of relief and Grant Balfour notched his 29th save as the A's upped their divisional lead over second-place Texas to 3 1/2 games.
Matt Garza (1-1) took the complete-game loss, yielding four runs on eight hits over eight innings. He walked one and fanned five.
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