The Oklahoma City Thunder had to come from behind to beat the Los Angeles Clippers 104-98, giving them a 4-2 series win over the Pacific Division champions.
Needing a victory to force the semi-final to a seventh game, the Clippers made a strong start, opening up a 14-point advantage by the end of the first quarter.
Chris Paul and Blake Griffin led the early charge, but the Thunder started to reduce their lead before the break, heading into half time eight points down.
The conference's second seeds continued their fightback with Kevin Durant and Russell Westbrook both recovering from slow starts.
After finishing the third quarter level, the Thunder still pushed in the fourth to make sure that they took the win, as Reggie Jackson added a late run of 14 from the bench.
The result sets the Thunder up for a conference final series against the San Antonio Spurs.