Durant poured in 28 points and three of Westbrook's 26 came on a late 3-pointer that helped seal the Thunder's victory.
Oklahoma City got 12 fourth-quarter points from Thabo Sefolosha to hang on for the win and improve to an NBA-best 12-2.
Paul Pierce's 24 points wasn't enough to prevent the Celtics' fifth straight loss -- Boston's longest skid since the 2006-07 season.
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