The Tampa Bay Rays scratched Shane McClanahan from his scheduled start against the Miami Marlins Tuesday because of left shoulder impingement.

McClanahan, 25, was named an All-Star last month and has a 2.20 ERA over 24 starts. He will undergo further testing on Wednesday.

"Going into the game, something just didn't feel right," McClanahan said. "Just couldn't get loose. Can't put a finger on it."