CONCORD, N.C. (AP) -- Dale Earnhardt Jr. will miss the next two races with his second concussion in the past six weeks, ending the championship chances of NASCAR's most popular driver.
The first concussion, suffered in a crash during an Aug. 29 tire test at Kansas, went undiagnosed until Wednesday, when Earnhardt was examined in Charlotte for lingering effects from Sunday's crash at Talladega.
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