10 a.m. - Welcome to NHRA SummitRacing.com Nationals race day. Stay tuned for our coverage of today's event.

11:15 a.m. - Good morning from The Strip at Las Vegas Motor Speedway and the second and final day of professional qualifying for the 15th annual SummitRacing.com NHRA Nationals. It's 71 degrees with partly sunny skies and a light breeze coming out of the east as Sportsman qualifying continues on the track.

Driver introductions for the K&N Pro Stock Horsepower Challenge are scheduled to begin at 12:30 p.m. (PDT) and the first round of the Challenge will take place at 1 p.m. The third Pro Stock and Nitro qualifying sessions are scheduled to begin at 1:10 p.m. and the final Pro qualifying sessions are scheduled for 3:50 p.m.

Check back here often, as we'll be updating this blog throughout the day with news, results and driver interviews.

11:30 a.m. - The $148,000 K&N Horsepower Challenge showcases eight Pro Stock teams in a race-within-a-race bonus event today at The Strip at Las Vegas Motor Speedway. The winner of the 30th annual K&N Horsepower Challenge will earn $50,000. The runner-up will earn $10,000, the two semifinalists $3,000 each, and the four first-round finishers $2,500 apiece.

The drivers competing in the event are Allen Johnson, a two-time winner of the Challenge, Vincent Nobile, Jeg Coughlin, Jason Line, Erica Enders-Stevens, V Gaines, Shane Gray and David Connolly. Seven of the teams qualified during a 24-race span from the 2013 SummitRacing.com NHRA Nationals in Las Vegas through the 2014 Amalie Motor Oil NHRA Gatornationals in Gainesville, Fla.  The eighth-place driver - Connolly - was selected via a special fan vote on the K&N website.

K&N Horsepower Challenge rounds are scheduled for 1 p.m., 3:45 p.m. and 4:45 p.m. today.

11:50 a.m. - Jimmy Alund is having his best weekend since taking over driving duties for Summit Racing Equipment Pro Stock driver Greg Anderson, who is recovering from off-season heart surgery.

Alund was the fifth quickest qualifier in the first session Friday and stands eighth going into today's final two qualifying sessions. The native of Sweden said he is enjoying his first trip to The Strip at Las Vegas Motor Speedway as a racer.

"I've been to Las Vegas as a spectator before, but I have never had the chance to race here," Alund said. "It's a very special place for this team because it's the hometown for our (Summit Racing) team owners, Ken and Judy Black. It's also a Summit (sponsored) race, and that makes it very important to all of us.

The car is coming along and I'm getting more acquainted with the way they race over here. I'm learning where the tools are, getting my own routines now around this camp. It's going to get better."

1:15 p.m. - Shane Gray, Erica Enders-Stevens, Jeg Coughlin Jr. and Dave Connolly were first-round winners in the $148,000 K&N Horsepower Challenge. Connolly will meet Gray in one semifinal and Coughlin will face Enders-Stevens in the other. The second round is scheduled to start at 3:45 p.m.

1:25 p.m. - Jeg Coughlin Jr., Chris McGaha and Erica Enders-Stevens remained the three quickest Pro Stock qualifiers following the third round of qualifying. In fact, all of the top 12 drivers' times from Friday's second round held up.

1:40 p.m. - In a surprising move, team owner Connie Kalitta replaced David Grubnic with J.R. Todd as driver of the Bounty Hunter Top Fuel dragster before Saturday's third round qualifying session. Third-round qualifying is underway now.

2:15 p.m. - Steve Torrence, Antron Brown and Doug Kalitta remained the top three Top Fuel qualifiers following the third qualifying session. Kalitta's 3.802-second pass at 323.19 was the low E.T. of the session. J.R. Todd, making his first pass in the Bounty Hunter Top Fuel dragster, turned in a pass of 3.896 seconds at 310.34 mph and moved into the 12th qualifying spot.

2:45 p.m. - John Force ripped off a pass of 4.058 seconds at 316.15 mph to briefly jump to the top of Funny Car qualifying in the third session, but Matt Hagan reclaimed the provisional pole with a 4.046 pass at 318.17 on the last run of the session. Force was second quickest and Robert Hight was third with a 4.059 pass at 317.49.

4:15 p.m. - Erica Enders-Stevens defeated Jeg Coughlin Jr. in one semifinal and David Connolly nipped Shane Gray in the other in Round 2 of the K&N Horsepower Challenge. Enders-Stevens and Connolly will meet in the final, which is scheduled to start at 4:45 p.m.

4:30 p.m.Jeg Coughlin Jr., Chris McGaha and Erica Enders-Stevens were the top three qualifiers after the fourth round of Pro Stock qualifying. 

4:40 p.m.Comments from Pro Stock pole-sitter Jeg Coughlin Jr. following the final qualifying session: 

"We're really proud to hold on to the number one position after four rounds. I think it really shows a lot about our team. We've had a great start to the new year so far and I've had a great ride today," said Coughlin Jr.

"It looks like we're going to have a lot cooler weather tomorrow for eliminations which will return us back to a more of a Friday set up for this car. We're really happy with the cars...both Allen and mine have run really well and to be number one feels great," said Coughlin Jr.

5:15 p.m.Antron Brown, Doug Kalitta and Steve Torrence took the top three spots in qualifying after the final Top Fuel qualifying session. Brown ran a blazing 3.768 at 325.14 run to grab the provisional pole. Kalitta's pass of 3.775 at 321.88 moved him to second and Torrence made a pass of 3.779 at 310.91. Spencer Massey was fourth and Tony Schumacher fifth going into Sunday's eliminations.

5:45 p.m. - Comments from Top Fuel pole-sitter Antron Brown (first of the season) following the final qualifying session:

"The track has been like Vegas, once we get past that first run, the track becomes really tight. Our class right now has just been incredible," said Brown.

"It's going to be tough, but we're looking forward to that challenge in the Matco Tools Top Fuel dragster and we hope that it will be a great win here tomorrow in Vegas," said Brown.

5:50 p.m. - Comments from K&N Horsepower Challenge winner Erica Enders-Steven:

"Today's been great. We've had a great hot rod all year and we had a great run in Gainesville. My guys have done a tremendous job and I am extremely thankful for this opportunity. What K&N and Toyota do for this sport is amazing," said Enders-Steven.

6 p.m. - Courtney Force, John Force and Tommy Johnson Jr. took the top three spots in qualifying after the final Funny Car qualifying session. Courtney sped to the top of the field with a record breaking speed with a run of 4.006 at 325.37. Force's pass of 4.017 at 317.87 landed him in the second place spot in front of Tommy Johnson Jr. who ran a 4.023 at 317.87.

6:10 p.m. - Comments from Funny Car pole-sitter Courtney Force (first of the season) following the final qualifying session:

"We're excited! We struggled at the beginning of the season, but coming out here, it felt good to have a consistent car back. We have had some good luck at this track," said Force.

"When I got out of the car and saw the 325, it's pretty amazing and exciting for sure. I was waiting for dad or Hagan to take that spot from me, but I’m really proud of my Ford Traxxis team and to have the car going this consistently makes you feel good," said Force.

6:20 p.m. - 

7:45 p.m. - Just a reminder that racing will begin at 8 a.m. Sunday with Sportsman eliminations. Pre race ceremonies will begin at 10 a.m. (PDT) and Round 1 Top Fuel eliminations starts at 11 a.m.

For results and elimination brackets, click HERE.

Good night from The Strip at Las Vegas Motor Speedway and be sure to check here Saturday and Sunday for updates from the 15th annual SummitRacing.com NHRA Nationals.