Chase Elliott and Dale Earnhardt Jr. -- teammates and sons of Hall of Fame drivers -- captured spots in the front row for the Feb. 26 Daytona 500, and their rivalry should give a boost to a sagging NASCAR series and its marquee event.

The rest of the grid will be determined by qualifying races on Thursday at Daytona Speedway.

Here's what you need to know:

What: Daytona 500 qualifying duel races

When: Thursday, Feb 23, 2017

Where: Daytona Speedway, Daytona Beach, Fla.

Time: 7 p.m. and 9 p.m. Eastern. (Each race is 60 laps, 150 miles.)

Practice runs from noon to 12:55 p.m. for the cars in the first Duel 150 qualifying race. Practice runs from 1 p.m. to 1:55 p.m. for cars in the second Duel.

TV: FS1

Livestream: Fox Sports Go

Duel 1 lineup:

1. Chase Elliott, Hendrick Motorsports

2. Brad Keselowski, Team Penske

3. Martin Truex Jr., Furniture Row Racing

4. Kevin Harvick, Stewart-Haas Racing

5. Matt Kenseth, Joe Gibbs Racing

6. Kyle Busch, Joe Gibbs Racing

7. Ricky Stenhouse Jr., Roush Fenway Racing

8. Daniel Suarez, Joe Gibbs Racing

9. Joey Logano, Team Penske

10. Trevor Bayne, Roush Fenway Racing

11. Paul Menard, Richard Childress Racing

12. Jamie McMurray, Chip Ganassi Racing

13. Aric Almirola, Richard Petty Motorsports

14. Landon Cassill, Front Row Motorsports

15. Matt DiBenedetto, Go Fas Racing

16. Chris Buescher, JTG Daugherty Racing

17. Brendan Gaughan, Beard Motorsports

18. Cole Whitt, TriStar Motorsports

19. Reed Sorenson, Premium Motorsports

20. Joey Gase, BK Racing

21. Corey LaJoie, BK Racing

Duel 2 lineup:

1. Dale Earnhardt Jr., Hendrick Motorsports

2. Clint Bowyer, Stewart-Haas Racing

3. Denny Hamlin, Joe Gibbs Racing

4. Kasey Kahne, Hendrick Motorsports

5. Ryan Newman, Richard Childress Racing

6. Ty Dillon, Germain Racing

7. Jimmie Johnson, Hendrick Motorsports

8. Kyle Larson, Chip Ganassi Racing

9. Ryan Blaney, Wood Brothers Racing

10. Erik Jones, Furniture Row Racing

11. Kurt Busch, Stewart-Haas Racing

12. Danica Patrick, Stewart-Haas Racing

13. Austin Dillon, Richard Childress Racing

14. AJ Allmendinger, JTG Daugherty Racing

15. Michael McDowell, Leavine Family Racing

16. David Ragan, Front Row Motorsports

17. Michael Waltrip, Premium Motorsports

18. Elliott Sadler, Tommy Baldwin Racing

19. D.J. Kennington, Gaunt Brothers Racing

20. Jeffrey Earnhardt, Circle Sport - The Motorsports Group

21.Timmy Hill, Rick Ware Racing

Elliott nipped Earnhardt on the final qualifying lap Sunday to win his second straight pole for the Daytona 500. Elliott turned a lap at 192.872 mph to just edge Earnhardt's speed of 192.864 and become the first repeat pole winner in 27 years.

"I don't really care who it is. I'm not going to feel bad about beating somebody," Elliott said. "Dale's a good guy. I'm happy to share the front row with him. Happier to beat him."

Earnhardt, long NASCAR's most popular driver, had the speed beat in his triumphant return after missing the second half of last season with a concussion. He missed the final 18 races with nausea, vision and balance issues after at least the fifth concussion of his career following a June wreck. He was as sharp as ever in the No. 88 Chevrolet headed into his first race since last July.

"Ain't much to it. The car does all the work," he said.

Elliott and Earnhardt gave Hendrick Motorsports and Chevrolet a 1-2 front row for the fifth time in the Daytona 500.

Elliott, the 21-year-old son of Hall of Fame driver and two-time Daytona 500 champion Bill Elliott, became the youngest Daytona 500 pole winner a year ago and proved in the No. 24 Chevy starting first last season was no fluke.

Elliott also made it three straight years for the No. 24 on the pole. Jeff Gordon won the pole in 2015 in his final season before he retired and turned the car over to Elliott.

(The Associated Press contributed to this report.)

Abbey Mastracco may be reached at amastracco@njadvancemedia.com. Follow her on Twitter @abbeymastracco. Find NJ.com on Facebook.