The Orioles have reinstated reliever Darren O'Day, who went on the 15-day disabled list on June 3 with a strained hamstring.
O'Day, 33, last pitched on June 1. He injured his hamstring covering first base in that game, which was against the Boston Red Sox.
Since coming to Baltimore in 2012, the veteran right-handed submariner has become a key part of the Orioles' bullpen. O'Day has gone 2-1 with a 3.15 ERA, two saves and 25 strikeouts in 22 games this season.
Last year, the Orioles' setup man went 6-2 with a 1.52 ERA and six saves, and he was named an All-Star for the first time in his career.
Also Sunday, the Orioles optioned LHP Donnie Hart to Double-A Bowie. Hart, 25, made his major league debut July 17 at Tampa Bay and tossed 2.2 scoreless innings over three appearances with the Orioles.