Oklahoma City plunged the final dagger into Kobe Bryant and Los Angeles Lakers with a 106-90 rout that sent the Thunder to their second consecutive NBA Western Conference finals.
Kevin Durant and Russell Westbrook propelled the rising Thunder while leaving the storied Lakers franchise in a state of uncertainty after completing the 4-1 best-of-seven series win.
Durant and Westbrook combined for 53 points and the home team withstood 42 from Kobe Bryant to set up a West final against the top-seed San Antonio Spurs.
In the East, Brandon Bass scored 27 points to spark the Boston Celtics to a 101-85 win over Philadelphia and move within one victory of a place in the NBA Eastern Conference Finals.
Bass found his shooting touch in the third quarter, where he scored 18 points to net a playoff career high and help the Celtics pull away from the 76ers.
The Game Five win gives Boston a 3-2 lead in the best-of-seven second-round series.
Kevin Garnett added 20, while Rajon Rondo tallied 13 points and 14 assists for Boston, who trailed early but outscored the 76ers 54-35 in the final two quarters.
Elton Brand lead Philadelphia with 19 points.
Game Six is in Philadelphia on Thursday.