Westbrook scored 29 points, making all 12 of his free throws, and Ibaka finished with 18 points, seven rebounds and three blocks.
The huge lead gave coach Scott Brooks the whole fourth quarter to rest his starters and give playing time to new acquisitions Derek Fisher and Ronnie Brewer. Fisher, who signed as a free agent after Oklahoma City traded third-string point guard Eric Maynor last week, gained a spot in the rotation and missed a pair of 3-pointers in each half.
Brewer, acquired in a trade with New York last week, played the entire fourth quarter along with Fisher and had five points.
"They bring toughness. They bring experience. They just know how to play," Brooks said. "They know where to be, they know when to get out of the way and they know when to make plays."
The Thunder never trailed and pulled away after a cranking up their defense late in the first half. New Orleans started out 18 for 36 from the field and was within 48-43, then made just nine of 41 shots (22 percent) after that. Oklahoma City recorded five blocks in the first 3½ minutes of the second half and never looked back.
"It wasn't just not making shots. We couldn't get a stop, either," Williams said.
Oklahoma City had allowed four straight opponents to shoot 46 percent or better before holding Chicago to an NBA season-low 29.1 percent in a 102-72 blowout Sunday night.
The Hornets rallied back from an early 14-point deficit with nine straight points to get within 45-41 on Al-Farouq Aminu's tip-in of a miss by Greivis Vasquez.
Durant responded with a 3-pointer on Oklahoma City's next possession, sparking a 17-4 flurry to finish the half by the Thunder and push the lead to 62-45.
Notes: Williams said the swelling in Davis' sprained left shoulder would be key in when he's able to return. New Orleans' next game is Friday night against Detroit. "Just talking to our trainers, optimistically he's probably day-to-day. We'll re-evaluate him when we get home tonight or tomorrow and see how he feels," Williams said. ... The 38-year-old Fisher signed with Oklahoma City for the final part of the season for a second straight year, and Brooks says it's not just about his locker room presence from winning five titles with the Los Angeles Lakers. "Derek gives us a great deal of experience and he's still a player. Trust me, we're not bringing him in here just to tell us good stories about Kobe and Shaq, how they won championship and he was the guy," Brooks said. "We're not going to eat S'mores together. He's going to play."