5:54 pm - That'll do it for today’s coverage. Tomorrow, Keselowski will go for the weekend sweep when the KOBALT 400 gets underway at high noon. Don’t forget to spring forward your clocks an hour so you won’t miss any of tomorrow’s action. Gates open at 7:30 am.

5:53 pm - NASCAR has completed post race inspection and the No 9 Chevrolet driven by Chase Elliott failed inspection after technical inspectors found the left front of the car to be too low. Officials also confiscated the right rear shock from Brad Keselowski's race-winning Ford for further evaluation, which will involve rechecking the pressure. Both drivers will keep their finishing positions. Elliott's team will face a penalty, which NASCAR will announce early next week. Keselowski's team may or may not face penalties depending on what NASCAR finds upon further review. 

5:05 pm - Regan Smith held onto the series points lead with a 10th place finish. He is three points ahead of Trevor Bayne, who finished 8th. Elliott Sadler, Ty Dillon and Chase Elliott round out the top 5.

4:55 pm - Chase Elliott led the Rookie of the Year contenders with a 5th place finish after starting 9th on the grid.

"It was a lot of fun," he said. "I think the biggest thing for us, it gives us the mindset that we can run up front. We unloaded super fast this weekend. Hopefully we can carry that into Bristol next week and go from there. I'm ready for next week. I'm excited to go."

4:40 pm - Brad Keselowski scored his 28th series victory despite sliding through his pit stall during the third caution and a late race alternator problem that threatened to drain his battery. He led 144 of 200 laps to post his first series victory at LVMS.

"We found every way we could to make it hard," said Keselowski. "The team did a great job. This Ford was flying today. Kyle (Busch) and I were pretty equal. These races aren't getting any easier to win. We were having some trouble with the engine there. I knew it was only a matter of time before (Busch) caught me. Kyle’s one of the best in the business. It was just our day. It was meant to be."

4:35 pm - To say Kyle Busch was disappointed with second place is an understatement. After starting from the rear of the field for unapproved adjustment after impound, the Joe Gibbs Racing driver led 33 laps but lost the lead to winner Keselowski on the restart on Lap 163 after the 4th caution of the race.

"The best motor won today, that's for sure," said Busch. “It’s frustrating to have to deal with that year in and year out but oh well. My car didn’t go. I stepped on the gas and I felt like I was holding a parachute. It just wouldn’t go.”

So, is he looking forward to tomorrow’s Cup race. Apparently not. As he left the Media Center he was offered good luck for the KOBALT 400 and his parting shot was dripping with sarcasm as he replied, “Oh, it’ll be a blast.”

3:51 pm - Keselowski takes the white flag and he's got a bunch of lapped cars in front of him. He weaves his way through and takes the checkers to win the Boyd Gaming 300. 2nd-5th: Busch, Larson, Earnhardt, Elliott. 

3:48 pm - Regan Smith hits the wall while running 8th. We stay green. Busch is 0.295-second behind Keselowski. 

3:42 pm - Keselowski is losing voltage on his battery. He's not carrying a backup battery so he'll have to hope it holds on for 14 more laps.

3:39 pm - Larson bypasses Earnhardt to take 3rd. Keselowski's lead over Busch is 1.78 seconds with 20 laps to go.

3:33 pm - Green Flag on Lap 168. Keselowski hangs onto the lead. Elliott is running 2nd followed by Busch, Earnhardt and Larson.

3:28 pm - Keselowski takes the lead on the restart as Busch falls back to 3rd. Ryan Sieg spins to bring out the 5th caution on Lap 164. Chris Buescher gets the free pass putting 10 cars on the lead lap.

3:26 pm - Running order under caution on Lap 162: Busch, Keselowski, Elliott, Earnhardt, Larson, Scott, Bayne, Kenseth, Smith.

Back to green on Lap 163.

3:22 pm - Caution #4 on Lap 160 - Kenseth gets three-quarters of the way sideways and somehow manages to avoid contact with anything and get his Toyota pointed back in the right direction. Kenseth heads to pit road for fresh tires. Smith gets the free pass (his second of the race). There are 9 cars on the lead lap. 

3:20 pm - Earnhardt peeks inside Busch for the lead on the restart but Busch hangs on. On Lap 154, Keselowski goes three-wide to climb back up to 3rd. 

3:18 pm - Back to green on Lap 153. 

3:15 pm - The leaders come to pit road. Busch wins the race off pit road. He is followed by Kenseth, Earnhardt and Elliott. 

Keselowski slides through his pit stall and has to back up. He'll fall from 2nd to fifth. 

Bayne gets the free pass back onto the lead lap. There are 8 cars on the lead lap.

3:12 pm - Caution #3 on Lap 149 - Debris in Turn 2.

3:10 pm - Kyle Busch continues to lead on Lap 141. Keselowski has already clinched the bonus for leading the most laps with 106 laps at the front of the field. 

3:06 pm - Gaughan was speeding when he served his pass through penalty, so he receives a stop and go penalty. Eric McClure is also penalized for speeding on pit road.

3:03 pm - Bayne, Crafton and James Buescher come down pit road to begin the 2nd round of green flag pit stops on Lap 113. Buescher is too fast and will have to serve a pass through penalty. More pit stops on Lap 114: Earnhardt and Dillon. Dillon was too fast entering pit road and he'll have to serve a pass through penalty. Lap 120: Kenseth makes a pit stop for tires, fuel and a track bar adjustment. Elliott is also on pit road. Lap 121: Keselowski pits and hands the lead to Busch. Lap 122: Busch to pit road along with Elliott Sadler. Kyle Larson takes the lead. He and Smith are the only two drivers left who have not yet made a stop.

Dillon doubles down on that penalty - he's popped for speeding while serving the first penalty and will now have to come to pit road for a stop and go penalty.

Lap 125: Smith comes to pit road.

Brendan Gaughan, Daryl Harr and Dakoda Armstrong receive speeding penalties.

Lap 130: Larson makes his pit stop and that completes this second round of green flag stops.

Running order: Busch, Keselowski, Kenseth, Earnhardt and Elliott. Busch's lead is 0.80-second.

2:46 pm - We're halfway through this race and Keselowski continues to dominate. His lead over Busch is 1.2 seconds. It's another 4.5 seconds back to Kenseth, who runs 3rd. Earnhardt is 4th and Elliott runs 5th. Elliott is reporting an intermittent vibration in the rear end of his Chevy. Pole winner Dillon is 7th, 6.8 seconds behind the leader.

2:37 pm - Keselowski has pulled out to a 1.3-second lead on Lap 54. 2nd-5th: Busch, Earnhardt, Kenseth and Elliott.

2:33 pm - Green flag on Lap 75. Keselowski goes low and takes Kenseth and Busch three-wide to retake the lead. Busch stays in second and Kenseth falls back to 4th.

2:28 pm - Kenseth takes the lead from Keselowski and Busch follows him into 2nd. Under caution for the second time on Lap 71 as Dylan Kwasniewski loses control and hits the outside wall. Running order: Kenseth, Busch, Keselowski, Scott, Earnhardt, Bayne, Ty Dillon. Regan Smith gets the free pass and comes down pit road to top off the gas tank. 10 cars on the lead lap.

2:25 pm - Chase Elliott gets the free pass and rejoins the lead lap. There are 9 cars on the lead lap. Back to green on Lap 70.

2:14 pm - We're still under caution on Lap 62 as NASCAR attempts to sort out the running order. 

2:03 pm - Lap 55: Keselowski, Kyle Busch and Ty Dillon to pit road. The caution flag flies for the first time on Lap 56 for debris on the track. Leaders under caution: Keselowski, Kenseth, Busch, Earnhardt and Brian Scott.

2:00 pm - Matt Crafton is the first driver to make a green flag stop on Lap 48. He's reporting a vibration in the No 33 Chevy. 

1:56 pm - Kenseth starts to put pressure on Keselowski as he pulls within 0.200-second on Lap 44. 

1:51 pm - Keselowski continues to lead the race. Matt Kenseth runs 2nd, 0.540-second behind. Four seconds separates those two from the rest of the field. Matt DiBenedetto and Tommy Joe Martins are in the garage. Jeff Green heads to garage and that clinches it...we will definitely have a first time LVMS winner when the checkers fall. Derrike Cope makes an unscheduled pit stop. There are only 15 cars on the lead lap on Lap 40. 

1:42 pm - Busch needed just 12 laps to climb back up to where he should have started. 

1:40 pm - Brad Keselowski takes the lead from Dillon on Lap 8. Busch is already up to 12th with just 9 laps in the books.

1:33 pm - Green Flag! Ty Dillon leads the first lap and Kyle Busch passes nine cars on his first trip around the speedway. Kyle Larson gets WAY loose on Lap 3. He makes contact with the outside wall but avoids the spin, puts his foot on the gas and continues on, losing several positions. 

1:25 pm - The drivers have just been given the command to start engines - by "Abraham Lincoln," no less. Ty Dillon will lead the field to green for the first time in his career. Today's event is scheduled for 200 laps.

Two drivers will drop to the rear of the field for the start. Kyle Busch gives up his 7th starting position for unapproved adjustments. Jeffrey Earnhardt missed driver's introductions. 

12:45 pm - We love odds in Las Vegas and the odds of seeing a first time Nationwide Series Las Vegas winner this afternoon are more than pretty good. Jeff Green is the only former winner in the field and he'll take the green flag from 32nd on the starting grid. Green won the inaugural series event in March 1997.

According to the oddsmakers at Bovada, Kyle Busch is a 7/4 favorite to win today's event.

12:35 pm - Jamie McMurray hangs on to lead the final Cup Series practice session with a 186.942 mph lap. 2nd through 5th: Austin Dillon, Clinton Bowyer, Kasey Kahne and Kevin Harvick. There was a (very) brief interruption in the closing moments of the session when Parker Kligerman appeared to have an engine let go in his No 30 Chevy and dropped some oil on the track. Greg Biffle had an anxious moment when he drove through the wet stuff but managed to avoid any contact with the wall.

12:00 pm - JR Motorsports Strong Out of the Box - Daytona winner Regan Smith is the current Nationwide Series points leader and he'll be looking to hang onto that lofty position with a strong run in this afternoon's event. His best finish at LVMS in 4 starts is 7th in last year's event. "We ran top-10 at Las Vegas last year, but I know we can do better and that's our primary focus here," said Smith, who will start 7th on the grid.

In addition to his driving duties, Smith is serving as mentor for 18-year old Chase Elliott. Elliott will make his third series start and his first at LVMS after qualifying 9th in the No 9 Chevy. "My confidence is at an all-time high right now and I'm going to maximize on it and continue to improve," said Elliott. "Also, it's extremely beneficial to have my teammates Regan and Dale, Jr helping me out. I will continue to learn from them, because they bring a wealth of knowledge to our program."

Dale Earnhardt, Jr climbs back into the No 88 Chevy for his second of three Nationwide Series starts scheduled for 2014. Earnhardt finished 11th at Daytona and then turned the steering wheel over to Kevin Harvick, who finished 2nd at Phoenix. "These guys are off to a good start," Earnhardt said. "I was impressed with how strong Kevin (Harvick) ran with them. I expect to keep that going at Vegas." Earnhardt will start 3rd in today's event. The third race on his schedule for 2014 is the April 4th event at Texas Motor Speedway.

11:30 am - Sprint Cup Series Happy Hour is underway. One last chance for the drivers and crews to dial in their setups for tomorrow's main event. Jamie McMurray is the early leader in the No 1 Chevy.

11:15 am - The Need for Airspeed - After a three-year hiatus, the Red Bull Air Race World Championship is back with an eight race schedule for 2014 that will include stops at Texas Motor Speedway on September 6-7 and Las Vegas Motor Speedway on October 11-12.

Texas native Kirby Chambliss, who will be among the pilots competing in this exciting series, is looking forward to racing in the Lone Star State. "We'll be racing in the motor speedways in the two stops in the United States. We did that previously in Germany and it's a really cool perspective from a spectator standpoint, because you're actually looking down on the airplanes as they race through the gates."

"We tend to draw people who love high-performance vehicles and certainly these airplanes are high-performance vehicles," added LVMS President and General Manager Chris Powell. "Yes, it's a bit of a new wrinkle for us at Las Vegas Motor speedway to be staging air racing, but fans who love performance are very much going to love watching these planes racing."

10:35 am - Rookie Ty Dillon wins the pole for today's Boyd Gaming 300 with a lap of 182.278 mph. Joining him on the front row is Cup pole winner, Brad Keselowski, who missed the pole sweep by just a tick over 0.100-second with a 181.702 mph lap. Rounding out the top five are Dale Earnhardt, Jr, Kyle Larson and Brian Scott. Kyle Busch and Kwasniewski will share the 4th row, and line up 7th and 8th. 

10:25 am - Second round qualifying is over and Ty Dillon was quickest at 181.476. Chase Elliott was less than 0.010-second behind, followed by Brian Scott, Kyle Larson and Brad Keselowski. Matt Crafton waited until the closing moments to post a lap that moved him from 18th to 8th and puts him in the running for the pole. Kyle Busch (7th) and Kwasniewski (9th) move on but Gaughan missed the cut with the 16th fastest lap.

10:05 am - The first round of qualifying comes to a close and Dale Earnhardt, Jr set the pace with a 179.724 mph lap. Second through fifth: Kyle Larson, Matt Kenseth, Brian Scott and Matt Crafton. Vegas native Dylan Kwasnieski made the cut in his backup car, posting a lap that was 18th fastest. Fellow Vegas drivers Kyle Busch, also in a backup car was 6th fastest and Brendan Gaughan was 13th. Both will transfer into the second round.

9:40 am - The Nationwide drivers are pulling off pit road for their first round of qualifying. They'll have 25 minutes to run as fast as they can and make the cutoff for the next round. The top 24 cars will advance. We've got 40 cars, so everyone will make the field.

9:35 am - The first Cup practice is over and nobody was able to beat Vickers' early fast lap of 188.950 mph. Rounding out the top five was Clint Bowyer, Brad Keselowski, Jimmie Johnson and Jamie McMurray.

9:25 am - KAHNE'S QUALIFYING WOES - There was a lot of talk yesterday about problems with the new the qualifying format related to fast cars and slow cars sharing the same playing field but Kasey Kahne had a different beef after failing to transfer to the third round by just 0.002-second. Kahne had a flat tire and wasted precious time during the first round waiting around for NASCAR officials to give their blessing for a tire change. When they did get approval, time was running out, Kahne missed his shot to run for the pole and ended up 13th on the starting grid.

"When I was cooling, I got a flat right rear (tire) so I had to come in," Kahne explained. "NASCAR doesn't have enough people to make a call that e can change it. So, we sat there and waited. That was what hurt us. If it's going to be that hectic and this much stuff going on, NASCAR needs to be are and get after it and make sure everybody can make the adjustments and the changes because we just had a flat. That is kind of disappointing."

9:12 am - The red flag is out. Cole Whitt lost control off Turn 2 and made contact with the outside wall. It looked like he had a problem with the right front tire. The team is unloading the back up car and they'll get busy preparing it for the final practice session. Whitt will give up his 26th starting position for tomorrow's race and start at the back of the field. 

8:41 am - The track is open and Brian Vickers is the early leader in race trim at 188.950 mph.

8:15 am - BUSCH LOOKING FOR 2 IN A ROW - Despite sitting atop the list of all Nationwide Series race winners, Kyle Busch is still seeking his first series victory at his home track. That is something he would love to see change by the end of today. If he can pull it off, it will be his second consecutive victory and 65th overall.

"I've come close (to a win) a couple times on the flatter surface," he said. "I came close here on the first race against Jeff Burton but there's been times where it's also been stupid fast and stupid silly things have bit me - blown tires and parts breaking and me spinning out and wrecking. All kinds of different things. This place has got one on me, for sure."

7:30 am - BOYD GAMING 300 RACE DAY -  Good morning and welcome to Day 3. The Sprint Cup drivers will have two more practice sessions today to dial in their cars for tomorrow's KOBALT 400. The first practice starts at 8:30 am and Happy Hour starts at 11:30 am. In between, the Nationwide cars will compete for starting positions in today's Boyd Gaming 300, which is scheduled to get the green flag 1:15 pm.