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The Athletics placed Estes on the 15-day injured list Wednesday, retroactive to Monday, with a herniated disc in his lower back.

Estes performed well Sunday during his return to the majors, firing four shutout innings while allowing one hit and striking out one batter. He'll now be forced to sit out until at least Sept. 9, however, and the A's will call up Brady Basso from Triple-A to fill the opening on the active roster.

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