O'Malley is no long on the 40-man roster, and Tacoma's season is done, but he remains in the Mariners' organization. The 29-year-old from Richland, Wash., played 20 games for Tacoma while rehabbing from shoulder surgery and hit .205 with three doubles, one home run and five RBIs in 78 at-bats.
O'Malley was competing for a spot on the Mariners' Opening Day roster in Spring Training when he had to undergo an appendectomy in March, and he later had surgery to repair his shoulder.
O'Malley hit .229 with two homers and 17 RBIs in 89 games with the Mariners last year after signing with the club in 2015 following two seasons in the Angels' organization.
Greg Johns has covered the Mariners since 1997, and for MLB.com since 2011. Follow him on Twitter @GregJohnsMLB. This story was not subject to the approval of Major League Baseball or its clubs.