Last night’s Cowboys-Giants game on NBC posted a 17.1, the highest overnight rating in the six-year history of Sunday Night Football. That was also the best overnight for any Sunday or Monday primetime NFL game in 13 years (since Broncos-Dolphins, which drew a 17.4 on December 21, 1998 on ABC), edging the previous SNF overnight record holder, this season’s Week 1 Cowboys-Jets game, by 1%. Versus last season’s Week 17 “win-and-in” game, the Cowboys-Giants face-off was up 36%. Still, last night’s game trailed the two Thursday night NFL openers of the last two seasons: the 2010 one (17.7) and the 2011 one (17.2). NBC dominated Sunday primetime riddled with repeats on the other nets.