Mazzoni was recalled from Triple-A Iowa on Sunday, Alyson Footer of MLB.com reports.
With Luke Farrell getting optioned down to Iowa and Rob Zastryzny (back) ending up on the 10-day disabled list, the Cubs needed some bullpen depth to wrap up their weekend series with the Reds. Mazzoni returns to the MLB roster with a 1.17 ERA and a 1.30 WHIP across 7.2 innings of work with the Cubs this season.