After signing Derek Fisher to help bolster their backcourt for the playoff push, the Thunder have assigned Reggie Jackson to the Tulsa 66ers of the D-League, tweets Darnell Mayberry of The Oklahoman. Jackson, 21, was a first-round draft pick by the Thunder in 2011 out of Boston College. The first-year guard is currently averaging 3.4 PPG and 1.7 APG in limited action.