Castle (thigh) is available for Wednesday's game versus the Thunder, Don Harris of News 4 San Antonio reports.
Castle is back after a one-game absence, which could result in Julian Champagnie or Devin Vassell heading back to the second unit. Castle is averaging 16.6 points, 7.0 assists, 5.0 rebounds, 1.1 triples and 1.3 steals per game this season.