Kevin Durant led Oklahoma City (26-8) with 29 points.
The Wizards (5-28), playing without their top two scorers, had lost 13 of their previous 14, but they also beat the Miami Heat earlier in the season. Beal and Martell Webster led the Washington with 22 points each.
Kevin Seraphin added 19 points, and Emeka Okafor had 12 points and 12 rebounds.
The Thunder missed 16 straight shots from midway through the third quarter to midway through the fourth quarter.
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