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NASCAR PLAYOFFS | CHICAGOLAND SPEEDWAY, SUNDAY, 3 P.M. (NBCSN)

Dale Earnhardt Jr. a sentimental choice in NASCAR playoff opener

JOLIET, IL - SEPTEMBER 16: Dale Earnhardt Jr., driver of the #88 AXALTA Chevrolet, signs autographs for fans during practice for the Monster Energy NASCAR Cup Series Tales of the Turtles 400 at Chicagoland Speedway on September 16, 2017 in Joliet, Illinois. (Photo by Jonathan Daniel/Getty Images)
Jonathan Danile/Getty Images
The retiring Dale Earnhardt Jr. is among the more popular drivers in the NASCAR Monster Cup Series.

JOLIET, Ill. — Dale Earnhardt Jr. received a stamp of approval from fans wanting to write letters to the retiring star, wishing him luck.

Jennifer Hoger has attended races at Chicagoland Speedway for 15 years and penned similar farewell notes to former NASCAR champions Jeff Gordon and Tony Stewart in their retirement seasons. She stopped at the red mailbox with No. 88 on the door to drop off her letter:

Dear Dale,

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Thank you for all the memories here (at)Chicagoland Speedway!! Good luck in your future endeavors!!!

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The Hoger Family

Bridgeview, Illinois

‘‘It’s just something I really wanted to do for him,’’ she said. ‘‘He’s just a regular guy when you see the way he interacts with people on pit road. He’s just a great guy.’’

Moments later, a track employee picked up the latest haul from the stuffed mailbox — she estimated 200 letters already had been written by Saturday morning — and promised they would be delivered to Junior by the end of race weekend.

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Randy Dunn had a simple note for NASCAR’s most popular driver:

Hi Jr.

Let’s Go Racing

Randy Dunn

Dunn wrote his Marion, Ill., address on the note just in case Junior wanted to write back and maybe spend some time with him.

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‘‘I hope so. I’m a very big fan,’’ Dunn said. ‘‘Whatever he wants to do is fine with me.’’

Fan enthusiasm hasn’t waned for Junior even as he’s stumbled through a disheartening final season that will end without a NASCAR Cup championship in his 18-year career. Earnhardt, a two-time Daytona 500 champion, has just one top-five finish this season and hasn’t finished better than 12th in his last 10 races in the No. 88 Chevrolet. When NASCAR’s version of the playoffs open Sunday at Chicagoland, Earnhardt starts with a more modest goal of finishing the season inside the top 20 in the standings.

‘‘We should’ve run well all year and gotten ourselves into the playoffs for all of our fans,’’ he said.

Earnhardt has been feted at tracks all season, receiving donations in his name and framed photos of great moments. At Chicagoland, he cuddled a puppy as the track announced an $8,800 donation to a Chicago-based animal shelter.

He strides through the garage hounded by autograph-seekers who know this is their last chance to receive that favored souvenir on their die cast, hat or poster.

There are 16 drivers in the NASCAR playoff field.

There’s only one driver with the stature of Dale Junior.

Earnhardt has been plagued by concussions the last several years, and he missed half of last season recovering from a head injury. He delayed contract talks on an extension to drive the No. 88 Chevrolet, and the winner of 26 career Cup races decided in the spring to call it quits this season.

A third-generation racer, Earnhardt turns 43 in October, is newly married and has said he wants to start a family. He has won NASCAR’s most popular driver award a record 14 times.

He wanted to win a championship for himself, his team and owner Rick Hendrick, but also for the fans who have idolized him because of his aw-shucks charm, candor and deep NASCAR roots. His late Hall of Fame father, Dale, won seven titles and was known as ‘‘The Intimidator.’’

Earnhardt just could never get it going in a bit of a lackluster season by Hendrick’s lofty standards.

Seven-time champion Jimmie Johnson had a quirky season in which his only three top-five finishes were wins. Chase Elliott made the playoffs on points and did not win a race. Kasey Kahne qualified with a Brickyard 400 victory but had otherwise been so inefficient over his Hendrick career that he’ll be dumped at the end of the season with a year left on his contract.

‘‘The pressure of trying to win the championship is not there, but that is a pressure that you kind of want,’’ Earnhardt said. ‘‘Even though you want it, it is not there. There is a concern, I guess, that you could get sort of complacent and go through these races and maybe some of the urgency or importance falls away a little bit because there is no ultimate carrot about there like that championship trophy.’’

Earnhardt is 22nd in points and qualified 20th for Sunday’s race. He has one career win at Chicagoland.

He is the latest — and biggest — star to leave NASCAR over the last three years, a brutal blow for a sport reeling from sagging attendance and sinking TV ratings. Gordon and Stewart won a combined seven championships. Just 10 laps shy of a championship, Carl Edwards abruptly quit at the end of last season. Danica Patrick, once an endorsement darling, saw her sponsorship dry up, lost her ride at Stewart-Haas Racing, and likely is finished in stock cars at the end of the season.

Elliott, Kyle Larson, and Ryan Blaney are the young playoff drivers expected to somehow carry that popularity torch held for so long by Earnhardt.

‘‘I thought building a brand, why would I want to do that? It should just build itself,’’ Earnhardt said. ‘‘But you can actively build your brand and grow it up. By the time these guys are 28 or 30 years old, they could be bigger than anything we’ve ever seen in this sport.’’

Kevin Harvick, the 2014 Cup champion, said NASCAR could still thrive without its stars.

‘‘Sports in general has a funny way of absorbing everything and moving on,’’ Harvick said. ‘‘And whether it’s Dale Junior or Danica or myself, no matter what the case is, things move and they shuffle and people come and they go and you hope that as you look in the pipeline there are young and exciting drivers that are going to develop their own personalities and their own fan base and their own excitement.’’

But can any driver truly rival Earnhardt’s following?

Check the mailbox in 20 years.