The Thunder got easy revenge on Thursday night, defeating the Lakers 131-102 in Oklahoma City.
On Sunday, the Lakers upset the Thunder 114-110, behind a career-high 42 points from Jodie Meeks.
Meeks led the Lakers with 19 on Thursday, but it wasn't nearly enough to help the Lakers keep pace.
Westbrook also had a game-high nine assists. Serge Ibaka neared a triple-double with 15 points, 13 rebounds and seven blocks. The Thunder shot 50.6% from the field while dominating the boards 60-37.
The Lakers shot well from three-point range, hitting 13-27 (48.1%) but made just 39.4% overall and missed 10 free throws (15-25).
When Kevin Durant picked up his fourth foul less than two minutes into the third, the Lakers looked like they'd make it a game when he went to the bench.
Instead, Russell Westbrook took over, scoring 29 points in almost 23 1/2 minutes.
Former Lakers forward Caron Butler hit a three-pointer at the buzzer to give the Thunder a 24-point lead after three quarters.
The Thunder shot 50.7% while dominating the boards, 44-28. Durant scored 17 while Serge Ibaka contributed 15 points, 13 rebounds and seven blocks.
The Thunder extended their lead over 20 before the Lakers pushed their deficit back down to 14 at the half.
Oklahoma City shot 47.8% from the field and dominated the boards 33-16.