Sewing up a 5-year contract over the weekend didn’t slow Thunder guard Russell Westbrook down as Oklahoma City trounced the Detroit Pistons 99-79 at Chesapeake Energy Arena Monday night.

Westbrook set the tone early as he contributed to the Thunder’s first eight points of the game with a lay-up, a dunk and two assists to running mate, Kevin Durant. Westbrook and Durant combined to go 9-14 with 20 of Oklahoma City’s first 29 points of the game.

“We did a good job defensively,” Westbrook said after the game. “We came out and did a good job at making our presence known at that end of the floor. I tried to set the tone in that way.”

Westbrook wasn’t lying. The Thunder locked down in the first half. Detroit combined to shoot 11-41 from the floor in the first half and was outrebounded by Oklahoma City 25-19. Detroit came into the game averaging 20.8 points per game in the first quarter, but was held to 12 by the Thunder.

“From the opening tip we really defended and got after it,” Thunder coach Scott Brooks said. “I thought (Rodney) Stuckey hit a couple of tough shots in the first 10 possessions, but other than that we were really good defensively for the first five minutes of the game.”

Westbrook and Durant continued to put on a show in the second half. The duo combined for 16 points on 8-9 shooting in the third quarter and for the fifth time of the season, neither played a minute in the fourth quarter. Westbrook finished the game with 24 points and six assists while Durant finished with 20 points on 9-13 shooting.

Thunder sixth man James Harden also contributed to the three-quarter blowout. Harden scored 18 points in the first half and extended his total to 24 with six points in the second. He also finished with five rebounds and four assists.

The Pistons didn’t help their cause down the stretch. Not only did they play terrible defense, they also couldn’t make buckets. The team combined to go 17-41 from the field in the second half and attempted just six three’s to try and dig back into the game. The Pistons shot 34.1% for the game and went 4-14 from beyond the arc.

Serge Ibaka and Kendrick Perkins helped Westbrook hold down the fort defensively. Ibaka finished the game with five blocked shots and ten rebounds and the big-man combo held Greg Monroe and Ben Wallace to 12 points on 3-16 shooting.

“I’ve always told Serge (Ibaka) that he has to do the things he does well at a high level,” Brooks said. “He blocks shots and rebounds at a high level and also runs the floor. Him and Perk play so well together. Those two guys read one another, help one another and that’s the sign of a good tandem.”

“We came out with a lot of intensity,” Kevin Durant added. “We got a good win and I thought on the defensive end was where we got our best game of the season.”