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Mariners preview: Nori Aoki, Leonys Martin will boost outfield defense

Despite playing home games at Safeco Field, one of the most spacious outfields in Major League Baseball, the Seattle Mariners had one of the worst outfield defenses in the league last season.

If that doesn't stand to reason, then you agree with general manager Jerry Dipoto, who told club president Kevin Mather during an interview last fall the Mariners roster was not suited for Safeco Field.

The Mariners went 36-45 last season in Seattle and 41-40 at home in 2014.

Last season, the outfield's UZR (ultimate zone rating) was -22.7, meaning the group cost them almost 23 runs.