Shelby Miller will make his Grapefruit League debut Saturday

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Cardinals prospect Shelby Miller experienced some mild soreness in his right shoulder last week while trying to ramp up his spring throwing program.

But it’s apparently already a non-issue.

Derrick Goold of the St. Louis Post-Dispatch reports that the righty is scheduled to make his Grapefruit League debut on Saturday against the Nationals. Adam Wainwright will start the game and then Miller will come in to pitch an inning or two.

Miller is in a stiff competition for the final spot in the Cardinals’ starting rotation with Trevor Rosenthal and Joe Kelly. The 22-year-old native of Houston, Texas registered a promising 1.32 ERA and struck out 16 batters over his first 13 2/3 major league innings last season. His upside is massive.