By Lori Vizza

Brad Keselowski overcame a speeding penalty on pit road and passed reigning Sprint Cup Series champion Kyle Busch to win the Kobalt 400 at Las Vegas Motor Speedway.

After winning yesterday's Xfinity Series race, Kyle Busch was in the hunt for the weekend sweep despite a disappointing 24th place qualifying effort. Busch was leading the race with just six laps to go when Keselowski passed him for the lead.

"What a day," said Keselowski, who led 24 laps. "I'm beat. I put everything I had into driving this car. I'm just so thrilled to be back in Victory Lane."

Keselowski had to overcome a speeding penalty with less than 100 laps to go to record his 18th career victory.

Joey Logano led seven times for 72 laps and finished 0.675-second behind Keselowski to complete the top two sweep for Team Penske.

 "Congratulations to Brad," said Logano. "Also for Team Penske getting the 1-2. That's what we set up to do every week. We ran really top two or three the whole race, so I was very proud of what our team was able to do all day."

Jimmy Johnson rounded out the top three after starting 11th and leading 76 laps.

Kyle Busch led 38 circuits but picked up a vibration with about 25 laps to go and had his hands full from there on out.

"There at the end, I didn't know if the tire was coming apart or what the deal was," said Busch, who had to settle for a fourth place finish. "I was trying to give it everything I had and that was all I had. It just would not turn. It just got so tight."

Pole winner Kurt Busch led the first 32 laps but was hit with a speeding penalty on pit road during the first caution that dropped him to the rear of the field. He was heading back toward the front when he was caught up in a multicar crash on Lap 198. Busch's car received minor damage but he was never able to make it back to the lead and recorded a ninth place finish.

Kyle Busch held onto the points lead. He is now seven points ahead of Johnson who leapfrogged from fifth to second. Rookie driver Ryan Blaney made the points move of the race climbing from 21st to 14th after a strong sixth place finish.

NASCAR continues its West Coast Swing with competition at Phoenix International Raceway next weekend.