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Robertson hit .280 with 10 runs, two doubles and seven RBIs in 75 at-bats over 37 games during two stints with the Angels this past season. He played 27 games in left field (11 starts), seven in center (four starts) and one in right.
Robertson batted .265 with 16 doubles and one home run in 60 games for Triple-A Salt Lake.
The 30-year-old California native played with the Rangers in 2014 when new Mariners bench coach Tim Bogar was bench coach and interim manager with Texas, putting up a .271/.333/.333 line in 70 games, with nine doubles, a triple and six stolen bases.
A 33rd-round Draft pick of the Padres out of Oregon State in 2008, Robertson has hit .299 with a .377 on-base percentage in eight Minor League seasons.
Ramirez, 27, was acquired from the D-backs on July 27 and was 0-1 with a 7.56 ERA in eight relief appearances as a September callup. He posted a 2.50 ERA in 14 games with Tacoma.
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.