Cubs' Cory Mazzoni: Sent back to Triple-A

Mazzoni was sent down to Triple-A Iowa on Tuesday, Carrie Muskat of MLB.com reports.

Mazzoni was up for just one day, tossing one scoreless inning. He has a decent chance to appear throughout the season in a low-leverage role. Rob Zastryzny was called up to take his place in the bullpen.