Russell Westbrook had 36 points, 12 rebounds and nine assists, and the Thunder beat the Mavericks 118-104 on Monday night to win the first-round playoff series 4-1 and advance to the Western Conference semifinals.
Westbrook was 13 of 23 from the field and 7 of 8 on free throws. Kevin Durant scored 33 points and Steven Adams added 15 points and 10 rebounds for the Thunder, who will play the San Antonio Spurs in a series that begins Saturday.
Oklahoma City shot 50.6 percent from the field and outrebounded the Mavericks 42-35.
The Thunder lost Game 2 85-84 at home, then won three straight, including two on the road.
Dirk Nowitzki scored 24 points.
Dwight Powell scored 16 points, Justin Anderson had 14 and Zaza Pachulia added 12 points, nine assists and seven rebounds for the Mavericks, who were hampered by injuries throughout the series.