St. Louis Cardinals infielder Khalil Greene was placed on the 15-day disabled list for the second time with social anxiety disorder on Monday. The Cardinals purchased the contract of right-hander Clayton Mortensen, 24, from Triple-A Memphis. That move restores St. Louis' pitching staff to 13 after one day with a dozen following the acquisition of Mark DeRosa from the Indians. Greene is batting .200 with five home runs and 19 RBIs.