The 30-year-old did not allow an earned run over his first seven appearances with the A's, but he surrendered 12 in his last 11 games, spanning 11 2/3 innings, for a 9.26 ERA in that stretch. Overall, opponents were hitting .293 against him.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.