The Athletics acquired first baseman Kila Ka'aihue from the Royals for minor league pitcher Ethan Hollingsworth, according to press releases from the teams. The A's recalled and transferred Joey Devine to the 60-day DL to open a spot on the 40-man roster for Ka'aihue.

Ka'aihue was designated for assignment by the Royals last Wednesday. The 27-year-old had a crack at the Royals' first base job coming into the season but was benched before the end of April. In four separate Triple-A stints, Ka'aihue has proven his ability to draw a walk in 15-20% of his plate appearances. His power has seemed to come and go, however. The A's had penciled in another walk-happy first baseman before the season in Daric Barton, but he was optioned to Triple-A in June and went down with a torn labrum the following month.

Hollingsworth, 24, posted a 3.76 ERA, 6.2 K/9, 2.3 BB/9, and 0.9 HR/9 in 105 1/3 innings this year between Double and Triple-A. The A's had acquired him in January from Colorado for Clayton Mortensen.

Bob Dutton of the Kansas City Star first reported the trade on Twitter.