If you thought NBC did the highest ratings for the NFL on Sunday, you’re wrong. Fox Sports’ NFC doubleheader package, which it markets as “America’s Game of the Week,” is No. 1; last year, it averaged 27.2 million viewers per telecast.

Fox is ready to cash in again.

Best games: Fox will go all-in with Seattle and San Francisco.  Fox opens with a San Francisco at Dallas doubleheader game in week 1. Cowboys at Seattle on Oct. 12. Seahawks at Philadelphia on Dec. 7. Obviously, Seattle at San Francisco on Dec. 14 could be huge.

Potential clunkers: Fox also is going all-in on the Cowboys. Dallas is slated to appear in five doubleheader games. If the Cowboys are underwhelming, a definite possibility, Fox will have to adjust.

Fox also has the Giants featured in several doubleheader games, including a trip to Seattle on Nov. 9. By then, New York could be done, forcing Fox to audible.

Bottom line: Fox could use good years from both Dallas and the Giants.