Dale Earnhardt Jr.

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FILE - In this July 1, 2016, file photo, Dale Earnhardt Jr. prepares before the start of practice at Daytona International Speedway, in Daytona Beach, Fla. Earnhardt, who missed the final 18 races of last season because of a concussion, has been medically cleared to return next year. Hendrick Motorsports announced Thursday, Dec. 8, 2016, that Earnhardt will take part in the season-opening Daytona 500. (AP Photo/Wilfredo Lee, File)

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In this Feb. 23, 2014, photo, Dale Earnhardt Jr., left, celebrates in Victory Lane with teammate Jeff Gordon, right, after winning the NASCAR Daytona 500 Sprint Cup series auto race at Daytona International Speedway in Daytona Beach, Fla. Gordon will get one more shot to win in Indianapolis this weekend when he replaces Earnhardt Jr. in the No. 88 car. On Wednesday, July 20, 2016, Hendrick Motorsports announced that Earnhardt would miss the next two weeks as he continues to battle balance issues and nausea. (AP Photo/Terry Renna, File)

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Dale Earnhardt Jr. celebrates after winning the NASCAR Sprint Cup Series auto race at Martinsville Speedway in Martinsville, Va., Sunday, Oct. 26, 2014. (AP Photo/Steve Helber)

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Jimmie Johnson (48) leads Dale Earnhardt Jr. (88), Brad Keselowski (2) and Joey Logano (22) during the NASCAR Sprint Cup Series auto race at Talladega Superspeedway, Sunday, Oct. 19, 2014, in Talladega, Ala. (AP Photo/Butch Dill)

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Dale Earnhardt Jr. waits in the garage during practice for Saturday's NASCAR Bank of America Sprint Cup series auto race in Concord, N.C., Thursday, Oct. 9, 2014. (AP Photo/Terry Renna) ** FILE **

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Brad Keselowski (2) and Dale Earnhardt Jr. (88) race across the line on a late race restart during the NASCAR Sprint Cup series Pocono 400 auto race, Sunday, June 8, 2014, in Long Pond, Pa. Dale Earnhardt Jr. won and Keselowski was second. (AP Photo/Mel Evans)

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Dale Earnhardt Jr. looks over his car during practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Chris Keane)

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Dale Earnhardt Jr. (88) leads the pack during the NASCAR Aaron's 499 Sprint Cup series auto race at Talladega Superspeedway, Sunday, May 4, 2014, in Talladega, Ala. (AP Photo/John Bazemore)