NASCAR remains a ratings winner for Fox. The network said Friday that 13 Sprint Cup races this season averaged a 4.8/10 rating. Fox also said live NASCAR viewership ranked No. 2 among men 18-49 and men 25-54 from February through the end of the broadcast season. NASCAR on Fox also posted ratings increases in five of the top seven and nine of the nation's 15 biggest markets, including Los Angeles (6 percent) and Chicago (32 percent). Overall, ratings grew 7 percent in the country's 56 biggest markets compared with a year ago. Last week's race at Dover, the final one this year for Fox, averaged 6 million viewers. The TNT portion of the NASCAR television schedule begins this week at Pocono Raceway.