Martinez has a 1.62 ERA on the year. He pitched four innings and gave up two runs in a rehab start in AA Springfield Thursday.
Matheny said catcher Yadier Molina should be ready to catch Martinez Tuesday. Molina has been out since May 5 after taking a foul tip to the groin injury and undergoing emergency surgery. He made a rehab start Saturday in Springfield. The eight-time All-Star caught five innings and drove in a run with a sacrifice fly. He'll make another rehab start Sunday.