Sprint

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Sprint Cup Series driver Ryan Newman leads the field to the green flag to start the Brickyard 400 at Indianapolis Motor Speedway, Sunday, July 28, 2013, in Indianapolis. (AP Photo/NASCAR, Tom Pennington, Pool)

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Sprint Cup Series driver Greg Biffle celebrates his win in the NASCAR Quicken Loans 400 auto race at Michigan International Speedway, Sunday, June 16, 2013 in Brooklyn, Mich. (AP Photo/Carlos Osorio)

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Full-page newspaper ads paid for by Dish Network, which wants to buy Sprint, liken the risks of a Sprint merger with Japanese company SoftBank to the 2006 effort by a company linked to the government of Dubai to run U.S. ports.

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Brad Keselowsk is dueling with Jimmie Johnson for the Sprint Cup championship, with just races left in the season. (Associated Press)

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FILE - In this July 13, 2012, file photo, Kyle Busch prepares for practice for a NASCAR Sprint Cup Series auto race at New Hampshire Motor Speedway in Loudon, N.H. Busch is looking toward the AdvoCare 500 auto race on Sunday, Sept. 2, at Atlanta Motor Speedway as an opportunity to boost his position as he clings to one of the wild card spots for the 12-driver Chase for the Sprint Cup championship. (AP Photo/Jim Cole, File)