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Jackson joined the Diamondbacks as a non-roster invitee Monday, Evan Woodberry of MLive.com reports.
The 36-year-old appears to face an uphill battle in his quest for an Opening Day roster spot. In 67.2 innings for the Blue Jays and Tigers last season, he struggled to a 9.58 ERA while striking out just 15.5 percent of opposing batters.
