Sefolosha had a two-handed slam on a fast break and also assisted on Kendrick Perkins' two-handed dunk during the burst, which extended Oklahoma City's lead to 60-45 before Harden's driving layup in the final second before halftime.
All but the first basket in the Thunder's run came after Asik joined Parsons on the bench with three fouls apiece.
The Rockets never recovered.
Notes: The game ball got switched out in the second quarter after it went into the stands and a drink was spilled on it. ... Harden scored a career-high 46 points in the Rockets' only regular-season win against Oklahoma City, but said he didn't gain any secrets from that performance to carry over into the playoffs. "I'm not going to lie. I was just making shots," he said. ... The Thunder improved to 18-5 in playoff games in Oklahoma City.