Korecky pitched 1 1/3 innings in his first Major League appearance since September 2012, and retired all four batters he faced.
Korecky was designated to make room for Marcus Stroman, who will be recalled from Triple-A Buffalo on Saturday for his first MLB start against the Royals.
In 22 games with the Bisons this season, Korecky had impressed, going 3-1 with a 0.29 ERA and five saves.
Jamie Ross is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.