Mazzoni was optioned to Triple-A Iowa by the Cubs on Tuesday, Carrie Muskat of reports.

Mazzoni struggled with a 13.50 ERA and 2.63 WHIP in six appearances with the Padres in 2017 before being claimed off waivers by the Cubs in November. The 28-year-old had a stellar 0.89 ERA, 1.03 WHIP and 31 strikeouts at Triple-A El Paso last season, numbers that if repeated could earn him another big-league opportunity in 2018.

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