Peters allowed nine earned runs on nine hits while walking three and striking out three across 2.2 innings in a loss to the Phillies on Saturday.
The Marlins lost by 19 runs Saturday, and Peters put them behind immediately after allowing a grand slam to Maikel Franco in the first inning. Peters saw some success in his season debut but lacks swing-and-miss stuff. It likely won't be as bad as Saturday anytime soon, but he won't survive all season in the rotation if his struggles continue.