The Orioles activated right fielder Nick Markakis (hamate bone fracture) from the 15-day disabled list after he completed a three-game injury rehab assignment with Double-A Bowie, the team announced Monday night. In order to make room for Markakis on the 25-man roster, the Orioles optioned first baseman Joe Mahoney back to Triple-A Norfolk. Markakis was placed on the DL for the first time in his career June 1, retroactive to May 30, with a right hamate bone fracture. He was 3-for-10 with two home runs and four RBIs during the rehab assignment with the Baysox.