It's Talladega time in the 2015 Chase for the Sprint Cup.

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The day many drivers and teams have been losing sleep over is finally here. It's Chase elimination day at Talladega Superspeedway.

At the end of Sunday's CampingWorld.com 500, four drivers will be eliminated from the Chase, while eight drivers will continue their championship quest for at least another three weeks.

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There are plenty of unknowns heading into Sunday's race, but it's sure to be intense and nail biting throughout. The threat of the "Big One" is very real, as is the possibility of an unexpected winner.

While there are unknowns surrounding what will happen once the green flag flies, here is everything you need to know about the Chase elimination race at Talladega:

Green flag:

2:49 p.m. ET

Grand marshal:

Marcus Lemonis, chairman and CEO of Camping World and Good Sam

Honorary starter:

Marcus Lemonis

Flyover:

B-2 Stealth Bomber, Whiteman AFB, Missouri

Forecast:

According to weather.com, the forecast for Sunday is calling for overcast skies with a high at 79 degrees. There is a zero percent chance of rain with light and variable winds.

Defending race winner:

Brad Keselowski. Full race recap here.

May race winner:

Dale Earnhardt Jr. Full race recap here.

Fastest in Practice 1:

Greg Biffle. Full practice recap here.

Fastest in Final Practice:

Brad Keselowski. Full practice recap here.

Chase standings:

1. Joey Logano: 3,095*

2. Denny Hamlin: 3,082

3. Kurt Busch: 3,077

4. Carl Edwards: 3,076

5. Kevin Harvick: 3,071

6. Jeff Gordon: 3,071

7. Brad Keselowski: 3,071

8. Martin Truex Jr.: 3,070

9. Kyle Busch: 3,064

10. Ryan Newman: 3,062

11. Dale Earnhardt Jr.: 3,039

12. Matt Kenseth: 3,035

*-Already clinched advancement to the next round.

Front row:

Jeff Gordon and Kasey Kahne. Full qualifying recap here.

Starting lineup: