Sessions put in 21 points and corralled five rebounds while Walker added 17 points as the Bobcats broke a five-game skid against Washington.
Vaunted first-round draft choice Michael Kidd-Gilchrist helped out with 15 points and eight boards while Tyrus Thomas also reached double figures 10 points in the win.
The Wizards, meanwhile, fell to 0-6 for the second consecutive season despite 19 points from Trevor Ariza.
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