The Duke-Gonzaga game on CBS drew the best overnight rating in 10 years for a Sunday NCAA Tournament regional final. The network announced Monday the 9.9 overnight rating. The Elite Eight doubleheader, including the Louisville-Michigan State game, averaged an 8.6 overnight rating/18 share, a 10 percent increase from last year. Through the Elite Eight, the NCAA Tournament is averaging 7.2/15 across TBS, CBS, TNT and truTV. That’s an 11 percent boost through the same period last year/Associated Press.