Morse, 31, is a career .284/.338/.479 hitter with 83 homers and 272 RBI in 561 major league games with the Mariners and Washington Nationals. In his major league career, Morse has batted .293/.349/.495 against left-handed pitching. Morse will wear number 38.
Avery, 23, saw action in 32 games for the Orioles in 2012, batting .223/.305/.340 with one home run, six RBI and six stolen bases. Avery split the 2013 season between Double-A Bowie and Triple-A Norfolk, batting .259/.340/.345 with three homers, 35 RBI and 29 stolen bases.