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Pittsburgh, PA (SportsNetwork.com) - The Miami Marlins designated pitcher Jacob Turner for assignment Tuesday, two days after the former first-round pick was roughed up in his most recent start.

Turner, who is just 4-7 with a 5.97 ERA while shifting between the rotation and the bullpen this season, is out of minor league options, meaning he will have to pass through waivers for the Marlins to keep him in the organization.

The 23-year-old had been considered one of Miami's top pitching prospects after being acquired by the Marlins as part of the July 2012 trade that sent established veterans Anibal Sanchez and Omar Infante to the Detroit Tigers. Turner has gone just 8-19 since the deal, however, and owns a 9-21 record with a 4.77 ERA over 53 major league appearances (45 starts).

Turner had won back-to-back outings heading into Sunday's start against Cincinnati, but was tagged for five runs and nine hits while lasting only four innings.

Pitcher Brian Flynn, who also came over to the Marlins in the Sanchez/Infante trade, was recalled from Triple-A New Orleans in a corresponding move.

Flynn has compiled a 7-8 record with a 4.00 ERA in 21 starts for the Zephyrs this season. The 6-foot-7 lefty made four starts for Miami last September, but was rocked for 17 runs over a combined 18 innings.