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Nieuwenhuis has spent parts of six seasons in the Majors, including four with the Mets from 2012-14. He played 10 games for the Angels in 2015 before being claimed back off waivers by the Mets. He then spent the past two years in the Brewers organization before being granted free agency last month.
The left-handed hitter has a .221/.311/.384 career line in 978 at-bats in 414 games in the Majors, and in 2015, he hit three home runs for the Mets against the D-backs at Citi Field. He hit .244/.362/.361 with four homers and 33 RBIs for Colorado Springs last year.
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.