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Rios was claimed off waivers by the Pirates on Saturday, Todd Zolecki of MLB.com reports.
Rios has shown very little in 55 career big-league innings, recording a 6.38 ERA, walking 10.5 percent of opposing batters, and striking out a modest 21.4 percent. He's spent most of the season at the Triple-A level, where he's struggled to a 7.41 ERA for Lehigh Valley, and will presumably remain in Triple-A with his new organization.
