BALTIMORE (AP) -The Oakland Athletics placed right-hander Connor Robertson on the 15-day disabled list Friday with a thumb injury and called up left-hander Erasmo Ramirez from Triple-A Sacramento.
Robertson fractured his right thumb in Monday's game against the Chicago White Sox. Since being recalled from Sacramento on May 15 to replace pitcher Huston Street, he allowed at least one run in each of his three outings.
Ramirez was 3-0 with a 1.27 ERA and two saves in 19 relief appearances with Sacramento. He last pitched in the major leagues in 2005 with the Texas Rangers.
To clear a spot for Ramirez on the 40-man roster, the A's designated right-hander David Shafer for assignment. Oakland also announced that catcher Jeremy Brown, who was designated for assignment Tuesday, cleared waivers and had been outrighted to Sacramento.

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