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Zimmermann threw six innings on Friday, allowing one run on four hits and two walks while striking out four.
Zimmermann struck out four without walking a batter in 2.2 innings of work during Wednesday's Grapefruit League action.
Zimmermann says he won't negotiate a new contract once the regular season begins, Jamal Collier of MLB.com reports.
The Cubs are in talks with the Nationals to acquire Zimmermann, the Chicago Sun-Times reports.