Joe Frisaro of MLB.com reports that the Marlins have designated John Koronka for assignment, following his second bad start for the Fish.
Koronka, 28, allowed nine earned runs through 7.1IP for the Marlins, totaling an ERA of 11.05. He allowed a .333 average to opposing hitters and issued seven walks as well.
Frisaro hasn't heard anything about who will replace Koronka on the roster or in the starting rotation, but names Brian Sanches as a possibility to be called up. He also suggests Hayden Penn and Burke Badenhop as potential replacements in the rotation.